*) Forgot to add the entries for mailman in the main.cf of postfix

• Added configure_dovecot function
• Updated functions configure_postfix, configure_pureftpd, configure_apache, install_ispconfig, configure_apps_vhost
• Bug fix in configure_amavis where installer was not including the ispconfig config file
• Bug fix in configure_apache where in suphp.conf the php handler line would be duplicated through updates
• replace double-quoted strings with single-quoted whenever appropriate
• changed inline comments to coding standards
• fixed OS specific paths
• changes to installer_base 1) add_database_server_record added os specific override of awstats paths 2) find_installed_apps courier not detecting correctly for gentoo

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- replace double-quotes with single-quotes whenever appropriate
- fix indentation

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

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

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

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.