Link a git revision to the changesets in title

Configured revision is added to the chosen topic field, the topic being located via the title entered in the form.

Form to be configured has the following fields:

• Title - Topic title. The topic will be located using this setting.
• Revision - The revision to be added to the topic field.
• Field - Topic field to which the revision will be added.
• User - Username to update the topic. If no user is configured, user 'Clarive' will be used.