New functions introduced, several rewrites:

New functions introduced, several rewrites:
- New function verifyExpertSettings() added which checks if the admin is aware
  of altering so-called expert settings, which may raise malfuntion in your
  mailer
- Several rewrites on XHTML
- More double quotes converted to single
- Other smaller issues fixed (e.g. non-working deletion of bonus mails)
- TODOs.txt updated