[test/ldap] fix ldap tests - make sure the url is properly updated on database setup (when the test database already exists and the ldap URI has changed) - fix the ldapuser test setup process.

[test] fix unittest_schemaserial.py A spurious add permission has been added in expected result by d988eec2d5d3

[test] make unittest_schemaserial.py runnable with python used to run fine only when launched using pytest

[facet] use facet name as input name for text widget (eg has_text) we need to ba able to distinguish between text-inputs so we can write a widget for a single facet that uses more than one text input. This fix consists in the diff in cubicweb.facts.js; modifications in facet.py result from this former.

[web doctype] don't give through reset_xmldecl to avoid double deprecation warning

[web doctype test] don't give reset_xmldecl to avoid deprecation warning

[devtool] randomise available ports search in http test This lowers the chance of parallel tests to race for the same port.

[facet] don't crash if no title specified on a facet and filtered rset is empty. Closes #2587883

[css, html] add a css_class attribute on Button, allowing to change easily default CSS class for buttons (think orbui integration)

[view] add 2 missing spaces before the previous link