Removed virtual_ config options from postfix main.cf file as they are not neede in a ispconfig 3 setup.
See also: FS#1582 - ISPConfig 3 postfix problem: mysql-virtual_mailbox_limit_maps.cf is missing

- Added a fix for opensuse regarding issue: FS#1250 - smtp file in pam.d directory on some distributions is world readable.

Merged revisions 1832-1836 from stable (added dovecot support for debian squeeze and added a new distid and class for debian6 specific modifications.

- Added Installation instructions for Fedora 12
- Added Dovecot support for fedora 12

- added installation instructions for opensuse 11.2 with bind and dovecot
- fixed a bug in bind plugin.
- improved opensuse installer.

Implemented: FS#973 - Gentoo support for installer. Fixed FS#974 - Directory mode for firewall configuration

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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