[idownloadable] refactor IDownloadable primary view to make overriding easier

[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.

[schema view] only catch key errors

[schema view] improve it slightly by attributing the same color to rdef of the same relation type

[rset] Add a line break the first result in repr of multiple rows rset Improve readability of rset while debugging by aligning the first value with the others if the rset have multiple row. This first line was usually not read as it' was on the same line that the first part of the repr ("<rset <RQL>, (%i rows) ...")