Check only for active records when performing a duplicate check for mailboxes / aliases / forwarders

Updated version number to 3.0.1.4 and changed sort order to domain name in the mailbox, alias and forward forms.

Improved client and reseller limit checks

Fixed: FS#787 - A sub-client can see all the clients on the system in the client drop down list 

Fixed: FS#778 - mailalias has priority over mailbox if they both exist. Added a error message that prevents it to add a alias or forward when a mailbox with the same email address exists.

Set version number to 3.0.1.3

FS#665 - Reseller adding email domain 
FS#666 - Reseller adding mysql database 

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- Fixed a login issue with safari.