First try of commit...

- doublequote replacement by single quotes in modules alias, apache_admin, backup_admin, bacupmgr, client_notices and cron, plus some minor changes :
- replaced "&" that must be encoded as "&amp;amp;" in links like  &lt;a href="xxx?par1=val1&amp;amp;par2=val2"&gt;
- found (and corrected) two time a double quote missing at end of class declaration like class="xxx (not closed) Sorry, I did not note the exact place.
- removed duplicate entry in ServerAlias generation in ApacheAdmin/hook/onDeamonRunHook
- added tests with value 0 to disable disk and bandwidth overquota in ApacheAdmin/hook/onDeamonRunHook

It is my ever first commit I do on any project, so I do it on a small files package to ensure I understood how it works and if what I done is acceptable.