[parser host mapping] take care to cases where apphome is None (c-c i18ncube command for instance)

backport stable

[test] update cwxml tests: computed cwuri have changed, and parser.parse isn't anymore a static method

[testlib] by default skip new 'manage' action's category

[manage view] filter before displaying anything avoid xhtml errors

[test] update cwuri test

[test] test extracted from unittest_hooks + new test for unique constraint check

[datafeed] introduce a host mapping so dev instance may transparently redirect request to another host than the actual's one

[management ui] add views to manage sources similarly to users

[manage view] cleanup manage view and user menu * drop code that shouldn't be there (e.g. folders handling) * add a section displaying site management actions, some of them were initially in the user's drop down menu, which now only have a 'manage' link with regards to management actions * stop displaying 'system' and 'schema' entities by default, only 'application' entities * put 'gc', 'registry' and 'info' views as tabs of a generic 'server information' view