Redmine

Adds an "Assign to me" button to the menu above and below issues.
On click on the button, the issue is assigned to the user. This makes it easier to pick tickets for later work.

If the current user is already assignee, no "Assign to me" button appears.

Unpack the redmine_assign_to_me directory into the redmine/plugins/ directory.
redmine/plugins/redmine_assign_to_me/init.rb should exist. Restart redmine, and the button should appear. For uninstallation, simply remove the redmine_assign_to_me directory.