[controller] fix wrong view name when error occurs in UndoController

[datafeed] renaming parser attribute to parser_id makes things clearer

cleanup and assert we don't import unexpected stuff

[source config] fix synchronization on configuration entity changes

[ui, sources] configure source form: hide synchronizing and mapping entities, use simple text input for parser

[rql annotation] fix bad invariant variable w/ has_text relation: this is only true when has_text will be used as principal (though we don't know that yet)

[test] update to new db handler api

[querier] turn remove_clauses/restore_clauses into a context manager

[devtools pg handler] some fixes so we get proper error when pg host is not reachable

[rdf] add method so one can call entity.view('rdf')

[web test] fix unittest_web

[ajax edition] freeze form button when calling validateForm, so it freeze nicely for e.g. comment submitting form

[web page tracking] fix bug introduced by parent revision

closes #1484510: ajax_replace_url should propagate page id (until an underlying api does it automatically

backport stable

[repo integrity] test and fix glob add relation where several entities are added at once for a relation of 1? cardinality