Remove unused files
Merge pull request #1024 from romainneutron/3.8-cleanup

[Ready][3.8] Remove unused files
Remove verbosity
Merge branch '3.8'

Conflicts:
	lib/classes/system/server.php
	tests/classes/system/serverTest.php
Merge pull request #1016 from nlegoff/log-user-query

[Ready][3.9] Use user manipulator to log user query
Transform thesaurus preset into doctrine Entity
Bump to version 3.9.0-alpha.15