[commit] Improvements to merge commit message

[aik099]

When committing a merge result the commit message looks similar to this:

Merging from Trunk to Stable
* r123: task title here
* r125: task title here

By default SVN clients (and SVN-Buddy is no exception) show only 1st line of commit message. This way when looking at merge commits they all look the same:

Merging from Trunk to Stable
Merging from Trunk to Stable
Merging from Trunk to Stable
Merging from Trunk to Stable
Merging from Trunk to Stable

Proposing to show number of merged revisions as well like so:

Merging from Trunk to Stable (3 bug(-s), 5 revision(-s))