Fixed a problem with broken tolower function in maildrop when compiled with some specific gcc settings by forcing lowercase addresses in master.cf and adding a workaround in case that tolower returns a empty result.

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Fixed a bug that prevented the modification of website settings of a site that the user created.

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- Replaced "virtual_mailbox_extended = yes" with "virtual_maildir_extended = yes" in the Postfix configuration.

- Fixed bug were the interface is enabled after an update on a server were interface = no selected during install
- Fixed a replication problem and made replication more fault tolerant.

- Improved installer and updater for multiserver mode. Modules and plugins were only configured if the selected service is available on the server.