Add recipient variable to canned reply context
Fix spelling error in documentation
Update class.ticket.php

I think this is a mistake, however not sure.
Tested it my self, works fine.
session: Override PHP default for session lifetime

The PHP.ini default is 1440 seconds (24 minutes). This should be configured
to something significantly higher so that the settings in the admin panel
concerning session timeouts are relevant.

Ideally, the settings from the control panel would be used, but currently
there is an inter-dependency between session and config startups.
email: No bounces for system alerts

Send an empty return-path envelope when sending out system alerts. If they
should happen to bounce for any reason, they should not return to the system
and create tickets.
Fix typo in suggested permissions for config file
Add release notes for v1.7.10