[datafeed] add parser to import cubicweb xml
this parser is configurable through a mapping, which basically
tells which entity's relation should be copied. Multiple actions
to control backport of data are available:
* 'copy': copy the external entities locally (though marked as
coming from the data feed source)
* 'link': find similar entity internaly (e.g. for states)
* 'link-or-create': try to find a similar entity internaly, and create
it if necessary (won't be marked as coming from the data feed source,
e.g. for tags)
<?xml version="1.0" encoding="UTF-8"?>
<display window-flags="sticky, below" width="185" height="200">
<sensor id="r" module="rqlsensor"/>
<sensor id="FS" module="FontSelector,1,Sans 10 black"/>
<!-- left border -->
<group x="0" width="5" height="200" bg-uri="gfx/border-left.png"/>
<image x="10" y="0" uri="gfx/logo_erudi.png"/>
<array id="results" x="10" y="30"
watch="layout=r:layout, length=r:length">
<label id="lbls1" color="black"
on-enter="r:enter-line"
on-leave="r:leave-line"
on-click="r:click-line"
watch="value=r:result, font=FS:font0, color=r:resultbg"/>
</array>
</display>