[test] do not overwrite user's CW_CUBES_PATH in unittest_migration
Currently when you rely on your CW_CUBES_PATH environment variable to
locate cubes necessary for cubicweb's tests, the migration test crashes
because it overrides the env var.
.. role:: raw-html(raw)
:format: html
RSS driven
----------
RSS is a pretty useful technology that can be widely used on this
site. Any set of data can be presented as RSS. You can then plug in
an RSS reader into that and follow the site activity. For example :
:raw-html:`<p><a class="reference"
href="../view?vid=rss&rql=Any+X%2CM+WHERE+X+modification_date+M+ORDERBY+M+DESC+LIMIT+30"><img
alt="rss" src="../data/rss.png"> latest changes</a></p>`