Bugfix #0022151 - Fixed css caching in custom skins (ILIAS 5.1)

With this bugfix, ilias uses the version of template.xml
to append the "?ver" parameter on the styles css src-string.
The versions dots will be replaced by hyphens, before
appending the "?ver" paramter.
In case of delos skin is in use, the string will not be
modified. In case you want not to use this feature just add
"$Id$" as version, like it is done at the delos template.xml.
You may edit this attribute any time you need in your skins
template.xml.

Bugfix of https://ilias.de/mantis/view.php?id=22151

0022209: ilSoapLearningProgressAdministration::deleteProgress: Orphaned active_id(s) (pull request available)

replaced jquery.nestable.js with that version used in 53x provided by bower libs, seems to fix offset related issues for mantis 0020127: Vertical ordering with nested terms does not work when page is scrolled

[FIX] 0020436: Test kopieren übernimmt nicht alle Einstellungen mit i…

Michael Jansen authored Oct 17, 2017 and Bjoern Heyser committed Nov 23, 2017

Fixed #21627 / \ilSoapLearningProgressAdministration::deleteProgress: Call to an undefined method ilObjTest::removeTestResultsForUser

fixed (hopefully all) image scr conmversions as well as linebreak issues in toJSON per qtype (mantis 20325)

made workaround for cloze test question the workaround for all SAformatted export contents (mantis 20325)

fixed bug #21837: Failed test: 1. Übungseinheit: Peer-Feedback mit Mindestlänge und vollem Namen > Portfolio als Abgabe für PF wenn es nur erstell