remove exec() calls, replace /usr/local/ispconfig with variable, replace double-quoted strings with single-quoted whenever appropriate

- The updater still asks for the port number, but with this update the default number that is shown is read from the vhost file as xaver suggested.

- Fixed a formatting problem with suphp.conf and newer suphp versions.

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Added --force switch to mysql command when the db dump gets imported back inti the database so that the import continues even if a database table is missing.

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

Fixed a bug when the server we want to update is a "real" Server with only VE's in it (and nothing else in his DB)

Set the user-rights for this table in the installer

- Added a robots.txt file in the root directory of the ispconfig interface to prevent it from being spidered by search engine robots that follow the robots excusion standard.
- Fixed a error message in the installer.

Impoved the software update function to enable the installation of apps like phpmyadmin into the apps vhost.

- Improved debian installer.

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

Added Support for Sieve mail filtering language on dovecot servers.

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