Fixed: FS#3226 - mail_user_update FAIL for changes with quota >2048 MB (Soap Error: quota_error_isint)

the path for the dkim-keys is automaticly creaed by the server-plugin, the path could be empty in the interface, and the amavis-template for gentoo was updated

- Use it like $app->conf('yourpluginname', 'config-key', 'value')
- omit the value to read the config value, provide it to set the value

changed the regex; new line at the end is allowed - prevents problems when using cut&paste for the private-key in the interface

do not change parameter order in old functions

do not change parameter order in old functions

Completly same functionality as VHost-Subdomain, not to disable if already existing vhostalias-somains in system.