[web] ajax_replace_url superseed build_ajax_replace_url, more generic and relying on the json controller (closes #750090)

[form] refactor meta-attributes handling: hide them by default using uicfg.afs instead of returning None (or not, according to skip_meta_attr flag argument) in guess_field

[repo] fix typo

[req] fix format_time w/ 0:0 which is evaluated to False

[view] ensure fallback_oid is specified before trying to select fallback view, else simply raise the exception

fix merge, forgot to save a buffer :(

backport stable

[rql2sql] fix special 'X relation NULL' case (used by security insertion), broken by recent removal of IS operator in RQL

[javascript] add a name property to namespaces, mainly for convenience in helpers such as movedToNamespace

[rql] IS operator killed in rql 0.26.2, use equal instead

[security] consider any rql expression refering to X while X is being created as satisfied

[rql] more update to 0.26.2 api

[querier] fix rset description bug with some union queries

[devtools] fix get_available_port implementation: it should only return the port number if unable to connect

[javascript] move CubicWeb object declaration to cubicweb.js, remove CubicWeb.provide/require, use cw instead of CubicWeb

[javascript] move Deferred implementation to cubicweb.ajax.js

[form] fix untested (unread?) has_been_modified implementation...

backport stable

[autoform] fix vreg module name

[pylint] fix detected name errors

[pylint] fix detected name errors

[repo server] fix startup bug, lgc.daemon.daemonize return 1 for the parent process, not -1

backport stable branch

[source] don't create the eid_creation connection at source initiliaztion time This fixes the "already opened connection bug" in db-restore for instance.