[MERGE] Improved commit reporting

[Ian Clatworthy]

After some discussion today, this patch supercedes the previous one
which proposed making commit less verbose.

The summary is:

1. The initial commit no longer lists every added file. Instead it
   shows the progress bar (as before but it's now visible/useful) and
   "Committed revision 1 (xxx changes made)." If you really
   want to see every file added still, use verbose mode.

2. Normal commits display output exactly as they did before.
   If you wish to see the total number of changes made as well,
   use verbose mode.

3. The previously reported performance improvements on initial commit
   are still there. Even when -v is used, it's still faster than
   before thanks to a suggestion on IRC from Robert.

Aaron indicated on IRC that he was concerned about special casing the
initial commit for UI consistency reasons. The "commit less verbose"
patch was consistent so we can roll back to that (say) if this is not
liked. On the whole, I think this is better though. Seeing 100s of
"added xxx" messages during an initial commit has never felt that useful
to me.

Ian C.
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