[xy] switch order of arguments for register_prefix()

HAVING sql clause don't know about comma...

[web/formwidgets] check on list (entity.related_cache swapped from tuple to list a while ago without known reasons), do not unicode wrap the eids

merge

[win32] defer import of logilab.common.daemon The module is not importable on windows, and etwist.service carefully avoids importing it (but imports etwist.server). Wait until we are sure not to be on windows to do the import)

[ajax] refactor/cleanup low-level ajax functions * loadxhtml/replacePageChunck/reload_component/reload_box deprecated in favor of loadXHTML / ajaxFuncArgs * some other cleanups in cubicweb.ajax.js * add js_render which will replace js_component (more generic, nicer argument passing handling)

[querier] test and fix potential bug in insertion query with multiple relations inside, caused by a name conflict. Also fix another bug non reproduced by using a set instead of a list (list may leads to compare entity instances which isn't allowed).

[form] avoid spurious warning subsequent for form's action refactoring w/ autoforms

backport stable

[web test] Add a CubicWebServerTC class to run test with a cw web serveur available.