Fix test-share and test-subrepo under Windows

patch: remove useless copy, cleanup

patch: separate reverse copy data (issue1959)

Add test for progress extension

progress: make progress.refresh=0 always display the progress line This has no effect in real world where progress.refresh in unlikely to be set to zero, but is very useful in tests where all progress output is to be traced. It failed on platforms with coarse time.time() granularity, like Windows+py25.

remove unused imports

progress: make use of progress.refresh