Have a new messaging util for custom filtering of error messages

Use MooseX Method signatures for a cleaner environment
possibility to search a subscriber by his number

Mantis: 0003599
Option to edit an existing contact, belonging to a customer

Mantis: 0003625
Add some fields to contacts form

also preselect the reseller in the contacts form
Mantis: 0003625
don't count terminated resellers in Dashboard

Mantis: 0003629
Fix some warnings due to non-numeric argument empty string ("")