[test] support for test on postgres database using the same mecanism as sqlite: one template database generated when necessary + actual test database created from the template
* * *
[test] reset postgres database between test of the same fixture
debian/tmp/usr/lib/PY_VERSION/site-packages/cubicweb/web usr/lib/PY_VERSION/site-packages/cubicweb
debian/tmp/usr/share/cubicweb/cubes/shared/data usr/share/cubicweb/cubes/shared
debian/tmp/usr/share/cubicweb/cubes/shared/wdoc usr/share/cubicweb/cubes/shared