[book] Improve PostgreSQL configuration section
* Do not advice for specific PostgreSQL version (point to meta-packages if
available in Linux distros);
* First mention packages from Linux distros, put the link to official postgres
documentation at the end;
Closes #2725302.
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<!-- Created with Inkscape (http://www.inkscape.org/) -->
<svg
xmlns:dc="http://purl.org/dc/elements/1.1/"
xmlns:cc="http://creativecommons.org/ns#"
xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
xmlns:svg="http://www.w3.org/2000/svg"
xmlns="http://www.w3.org/2000/svg"
xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
width="1036.6421"
height="845.07812"
id="svg2"
sodipodi:version="0.32"
inkscape:version="0.46"
sodipodi:docname="main_template.svg"
inkscape:output_extension="org.inkscape.output.svg.inkscape"
version="1.0"
inkscape:export-filename="/home/auc/cw/doc/book/en/images/main_template.png"
inkscape:export-xdpi="60.659016"
inkscape:export-ydpi="60.659016">
<defs
id="defs4">
<inkscape:perspective
sodipodi:type="inkscape:persp3d"
inkscape:vp_x="0 : 526.18109 : 1"
inkscape:vp_y="0 : 1000 : 0"
inkscape:vp_z="744.09448 : 526.18109 : 1"
inkscape:persp3d-origin="372.04724 : 350.78739 : 1"
id="perspective10" />
</defs>
<sodipodi:namedview
id="base"
pagecolor="#ffffff"
bordercolor="#666666"
borderopacity="1.0"
inkscape:pageopacity="0.0"
inkscape:pageshadow="2"
inkscape:zoom="0.80355603"
inkscape:cx="510.91495"
inkscape:cy="422.53906"
inkscape:document-units="px"
inkscape:current-layer="layer1"
showgrid="false"
inkscape:window-width="925"
inkscape:window-height="1168"
inkscape:window-x="0"
inkscape:window-y="0"
inkscape:snap-bbox="true" />
<metadata
id="metadata7">
<rdf:RDF>
<cc:Work
rdf:about="">
<dc:format>image/svg+xml</dc:format>
<dc:type
rdf:resource="http://purl.org/dc/dcmitype/StillImage" />
</cc:Work>
</rdf:RDF>
</metadata>
<g
inkscape:label="Calque 1"
inkscape:groupmode="layer"
id="layer1"
transform="translate(162.2968,90.697922)">
<rect
style="fill:#ffffff;fill-rule:evenodd;stroke:#000000;stroke-width:1.775;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1"
id="rect2439"
width="854.37006"
height="698.2019"
x="20.307629"
y="-20.575344" />
<rect
style="fill:#ffffff;fill-rule:evenodd;stroke:#000000;stroke-width:1.775;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1"
id="rect3301"
width="816.3457"
height="508.15628"
x="31.751091"
y="96.33345" />
<g
id="g3220"
transform="matrix(1.0035394,0,0,1,0.5745006,0)">
<rect
y="-89.447922"
x="-161.0468"
height="55.714287"
width="1031.1713"
id="rect3240"
style="fill:#dfdfdf;fill-opacity:1;fill-rule:evenodd;stroke:#000000;stroke-width:2.50000024;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1" />
<text
id="text3264"
y="-51.771908"
x="757.85767"
style="font-size:23.38711166px;font-style:normal;font-weight:normal;fill:#000000;fill-opacity:1;stroke:none;stroke-width:2.5;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1;font-family:Bitstream Vera Sans"
xml:space="preserve"><tspan
id="tspan3266"
y="-51.771908"
x="757.85767"
sodipodi:role="line">header</tspan></text>
</g>
<rect
style="fill:#dfdfdf;fill-opacity:1;fill-rule:evenodd;stroke:#000000;stroke-width:1.775;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1"
id="rect3270"
width="167.87744"
height="707.71222"
x="-160.02441"
y="-24.671618" />
<g
id="g2434"
transform="matrix(0.975467,0,0,1,0.6942419,-3.6587365)">
<rect
y="35.365849"
x="29.548275"
height="55.714287"
width="842.59979"
id="rect3279"
style="fill:#dfdfdf;fill-opacity:1;fill-rule:evenodd;stroke:#000000;stroke-width:2.5;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1" />
<text
id="text3281"
y="72.885193"
x="681.65283"
style="font-size:23.38711166px;font-style:normal;font-weight:normal;fill:#000000;fill-opacity:1;stroke:none;stroke-width:2.5;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1;font-family:Bitstream Vera Sans"
xml:space="preserve"><tspan
id="tspan3283"
y="72.885193"
x="681.65283"
sodipodi:role="line">contentheader</tspan></text>
</g>
<g
id="g3170"
transform="matrix(1.0023324,0,0,1,-2.0421673,-10.976211)">
<rect
y="698.6355"
x="-158.28485"
height="55.714287"
width="1032.5997"
id="rect3285"
style="fill:#dfdfdf;fill-opacity:1;fill-rule:evenodd;stroke:#000000;stroke-width:2.5;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1" />
<text
id="text3287"
y="736.52045"
x="770.28204"
style="font-size:23.38711166px;font-style:normal;font-weight:normal;fill:#000000;fill-opacity:1;stroke:none;stroke-width:2.5;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1;font-family:Bitstream Vera Sans"
xml:space="preserve"><tspan
id="tspan3289"
y="736.52045"
x="770.28204"
sodipodi:role="line">footer</tspan></text>
</g>
<g
id="g3211" />
<g
id="g3215"
transform="matrix(0.9712065,0,0,1,0.7659296,-17.074106)">
<rect
style="fill:#dfdfdf;fill-opacity:1;fill-rule:evenodd;stroke:#000000;stroke-width:2.5;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1"
id="rect3291"
width="844.62012"
height="55.714287"
x="27.850754"
y="629.88562" />
<text
id="text3293"
y="666.60339"
x="692.85773"
style="font-size:23.38711166px;font-style:normal;font-weight:normal;fill:#000000;fill-opacity:1;stroke:none;stroke-width:2.5;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1;font-family:Bitstream Vera Sans"
xml:space="preserve"><tspan
id="tspan3295"
y="666.60339"
x="692.85773"
sodipodi:role="line">contentfooter</tspan></text>
</g>
<text
xml:space="preserve"
style="font-size:23.38711166px;font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;text-align:start;line-height:125%;writing-mode:lr-tb;text-anchor:start;fill:#000000;fill-opacity:1;stroke:none;stroke-width:2.5;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1;font-family:Bitstream Vera Sans;-inkscape-font-specification:Bitstream Vera Sans"
x="-143.67273"
y="20.58094"
id="text3297"
sodipodi:linespacing="125%"><tspan
sodipodi:role="line"
id="tspan2432"
x="-143.67273"
y="20.58094">left column</tspan></text>
<text
transform="scale(0.9876573,1.0124969)"
id="text3175"
y="12.071429"
x="721.0575"
style="font-size:23.09845161px;font-style:normal;font-weight:normal;fill:#000000;fill-opacity:1;stroke:none;stroke-width:2.5;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1;font-family:Bitstream Vera Sans"
xml:space="preserve"><tspan
id="tspan3177"
y="12.071429"
x="721.0575"
sodipodi:role="line">contentcol</tspan></text>
<text
transform="scale(0.9876573,1.0124969)"
id="text3179"
y="126.27104"
x="701.45959"
style="font-size:23.09845161px;font-style:normal;font-weight:normal;fill:#000000;fill-opacity:1;stroke:none;stroke-width:2.5;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1;font-family:Bitstream Vera Sans"
xml:space="preserve"><tspan
id="tspan3181"
y="126.27104"
x="701.45959"
sodipodi:role="line">contentmain</tspan></text>
</g>
</svg>