There is now a summary of conflicts and skips printed after an up/sw/merge
operation. However, there are minor problems with it:
* The summary is printed at the end of processing each target, not at the end
of the whole operation. This means that a summary can scroll out of the user's
sight, defeating its purpose.
* When "update" skips a whole target (as opposed to some node within the
target), it does not issue an "end of update" notification, and the summary does
not get printed. This is not a problem in itself because the entire output is
known to be just one line so there is no need for a summary. But when the
summary is not printed, its counters do not get reset. A summary printed on
completion of some later target will include the skip counts from any
immediately preceding targets that were skipped.
The summary should be printed at the end of the whole operation. This would fix
both of the problems.