New MailScanner Front-End (MSFE) v7.21

Changes:

• Moved setting “Keep x days of MySQL database entries” to the MailControl Settings page
• Added new setting “Keep x days of Quarantine entries” to the MailControl Settings page. This updates /usr/mailscanner/etc/defaults and is also used to modify that file whenever MSFE is upgraded to keep    the setting intact
• Always show the Full Message button in the MailControl email view
• Added feature that auto-selects all the text in Full Message view
• Modified the way virus.scanning.rules works so that virus infected emails can be released from quarantine
• Ensure msbe.pl is run on upgrade to regenerate rules files