Fix usermod command on SLES.

Refs #5094
Fix PHP package name on SLES.

Refs #5094
Enable mod_rewrite in the SLES package.

Refs #5094
Add 'Allow from all' in the Apache config.

Refs #5094
Remove unused dependency.

Refs #5094
Update mailinglists.
Update release download from github.
Fix: Hide inactive objects

fixes #5646
Fix non-breaking space UTF-8 character throughout the code

This is a char inserted on a Mac by using ALT+Space.

Char: U+00A0 --> " "

Fixes #4965 #4966
Removed unnecessary try/catch block on ApiCommand.

Adopted from GitHub pull request ##1

Fixes #5465
Refs #5013
Added unique index to nsm_session for indexing the really used session_id.

Fixes #5668