Changed query syntax of alias domain edit file
Changed deprecated syntax in alpha plesk importer

Bugfix: Attachments were not cleaned up on finish() call of mail class (next recipient gets all attachments, too)
Update: some import tests for plesk

Bugfix on db-Class (datalog Update)

FS#2288 - Importer for data from Plesk control panel (first INCOMPLETE version, see bugtracker for status)

- Improved datalog functions.

Extended datalogUpdate and datalogInsert function in mysql library so that insert_data and update_data arguments can be passed as array too.

Also removed the calls to the db closeConn calls in favor of
destryong the connections on the class __destruct() 's..

Since firebird db had a closeConn as well, changed its __destruct
to calls its own personal closeConn which otherwise left unmodified.

Refs: 1722

Added destructor and session write to app class instead.