merge changes from stable branch

[parsers] format read by web/views/xmlrss is relation=%s-%s not %s_%s

[sql] implement #1631319: ask user before creating postgresql languages

[parsers] improve url construction by using stdlib's urllib instead of str concatenation fix a s/_/-/ bug on the way.

[bfss] Catch EnvironmentError instead of OSError when trying to read attributes bffstored This will also catch IOError (as file not found) that might be encountered expectable too.

merge changes from stable branch

[views/iprogress] rename to make things easier to read and understand

[datafeed cwxml parser] cache processed urls/entities to avoid unnecessary http requests and processing

backport stable

[rql2sql] fix missing sql restriction w/ attribute restriction where value comes from a subquery

[dataimport] fix #1732685: cached entity and shared cw_edited data with NoHookRQLObjectStore

[parsers] fix python2.5 compat problem introduced by 7466:395c966a1cb3

[test] update cubicweb/test/unittest_schema.py (to follow yams#.....)

[server] fix NameError (missing VIRTUAL_RTYPES import) in checkintegrity.py

[schema] fix computing of has_text relation: when a fulltext_container relation is added, we need to recompute has_text for the target entity type as well. Also, avoid computation when not needed

[parsers] remove build_search_rql() that duplicates find_entities()

[vreg] help understanding assertion error

[datetime] by default display 'UTC' string when displaying TZDatetime

[test] update test to avoid failure

[web] fix typo

[datafeed] fix stupid error introduced by 'just before qfinish' refactoring...

[schema] support for BigInt type. Closes #1720995

[test,i18n] update test and i18n catalog to follow addition of 'synchronizing' attribute on sources

[i18n] update yams error messages (requires yams#67668)

[datafeed] provide a source-sync command to launch source synchronization through the command line. Closes #1725692

[datafeed] use a boolean flag on CWSource to ensure we don't have concurrent synchronizations. Closes #1725690

[views] add columns parser and latest_retrieval to cwsource admin view

backport stable

Fix name error introduced in c21d845836e4 c21d845836e4 use a ``vocab`` variable but doesn't define it. I assumed ``vocab`` is ``field.vocabulary(form)``.

Fix conditionnal logic broken in 195b24fe3a03 195b24fe3a03 replace: if not req.cnx: by if getattr(req, 'cnx', True): The "not" diseapeared in the process.

[session] provide a simple transaction context manager for session. Closes #1725640

[formwidgets] make the select size a class attribute (more easily tuned)

[bfss] Make ``current_fs_path`` return None when an attribute has no value current_fs_path was returning the future fspath when no value was defined. * This does not make any sense * This tricks the storage into believing that updating the attribute content is not necessary. The file was written but the attributes was not updated. as a result the assignement was not made. (close #1725446)

[selectors] take care, Session has no cnx

don't crash if we can't fetch data or if xml is malformed

[datafeed] extract some methods from pull_data to ease writing custom datafeed sources

drop useless code

backport stable

[datafeed] we should use utc timestamp to avoid pb with local times

[test] fix failure introduced by yams'changeset 644:f9c79356b758

[testlib] add convenience assertion method to check __message

[test] fix failure introduced by 1719eab69551: the regexp should be fixed, not the error message

[web test] fix test failures introduced by 7431:cab99ccdb774

backport stable changes

[ui message] fix regression introduced by 7429:ef5165fa99e0, leading to 'None' message displayed in the ui

backport stable changes

[json controller] fix .exception call msg format string (missing one slot)

[test] fix tests broken by 7427:5338d895b891

merge default heads

[ui messages, xss] Start migration towards use of _msgid instead of __message (prone to XSS injection) closes #1698245

backport stable

[ui messages] make application message component works when request has no cnx set and support for explicit message given through render argument

backport stable

[web session] fix session handling so we get a chance to have for instance the 'forgotpwd' feature working on a site where anonymous are not allowed fix several pbs: * we need a session id and a session cookie anyway, else subsequent http queries are unrelated * this imply some changes in the session attribution workflow for session without a cnx * some views/selectors must be fixed for cases where session has no cnx On the way, avoid unnecessary Redirect on successful login. closes #750543

[ajax js/css] modconcat fix: load code exactly once (auc, fcayre) * introduces cw.ajax namespace (currently hosts only recent modconcat functionality) * handle load-one/load-many-at-once edge case * properly handle already-loaded js resource * avoid .appendTo to trigger script evaluation since from jquery 1.5 this results in uncached ajax calls

[test] update test broken by previous commit