Check in the branch cycle demonstrator.
Reduce the QED test case by removing duplicative tags (but no branch tags).
In generated test repositiries, fix the module namee to "module"...

...rather than, as previously, the repo's basename. This conforms with
our inported t960* examples.

Using this uniformity, write a Makefile prodoction that can generate
a DOT visualization of any of the test repositories.

All regression tests pass.
Crearte a dot-based visualizer for the test repos and files.

All regression tests pass.
The ,v rule had surprising effect on default behavior.  Work around it.
Fix some bitrot.
Give -v a useful meaning.  All regression tests pass.
Infrastructure for verbose reporting in the merge code.

All regression tests pass.
Only unlink blobdir if we created it
Better interaction between progress and warning messages.
Generate debug messages a bit more cleanly.  All regression tests pass.
Fix compile warning on cygwin