[entity] move req.create_entity content to a cw_instantiate factory method on entity classes, so cube developpers will be able to easily customize instance creation

[controller] refactor send mail controller to use cwconfig.sendmails

[test] properly close session

backport stable

le patch move-pdf-export-to-cubes a été importé

[hooks] fix set_operation options passing (** -> *)

[session] no way for queries from an InternalSession to be a dbapi query

[merge]

[doc/book] begin chapter on Hooks/Operations

[doc/book] dbapi: talk about IN exception, simplify

[doc/book] rql/dbapi cleanup, rip cachekey (prematurely ?)

[doc/css] cleanup a bit the sphinx default css

[repository] fix bad indentation in glob_update_entity, source.update_entity() should be called once per update

[doc] note on pytestconf, fixlets

[test] avoid weird bug when test are changing the cwd

[c-c newcube] #1192: simpler cubicweb-ctl newcube, and more * new --layout option, to get 'simple' or 'full' cube * new --licence option to specify license for the cube * added README and sobjects.py template (the later only added in full layout) * fixed python file templates to get proper headers according to the config

[storage] consider fs_importing on update operations too

[primary] fix name error

[migration] propagate TrInfo.comment permissions fix to existing instances

[xthml] fix #696079, potential empty table cause xhtml validation error

[schema] #847739: test and fix bad permission on TrInfo.comment

[iprogress] use xml_escape instead of buggy replace

backport stable

[querier] don't need a Cache instance for rql cacke key cache

[testlib] properly close connections opened during test in tearDown

#759035: Automate addition of eid cachekey in RQL analysis

[rql annotation] add test and fix for bug introduced by 5004:4cc020ee70e2. While it sounded good, it wasn't because stinfo['relations'] didn't include anymore stinfo['typerels']

merge

merge

merged back old local changeset