Only resets on copy, and also resets due date.
Merge pull request #68 from blrnw3/copy-fix

Only resets on copy, and also resets due date.
Merge branch 'master' of https://github.com/artsalliancemedia/redmine
Changed due date calculation when in breach

When an issue is in breach, pausing will now further extend the due
date.
A small caveat is if there is a current pause, it is not taken into
account, as this would require constant recomputation of the due date,
which is something we are trying to avoid.