Need for filtering by path sugggested by kn@ ok naddy@

positive feedback from Omar and kn ok kn

This has the advantage of tags being located right by the full command; combined with tags ":tco" to search for the `co` alias will jump right to the `checkout` line, neatly showing everything without needing further navigation. tmux hint from Thomas Adam, thanks. OK stsp

ok jrick

Specifically, obstructed files are versioned files which should be on disk but have been replaced on disk by a non-regular file (e.g. by a directory). The man page used the phrase "deletion was obstructed" which is unrelated to the above concept and can be expressed as "deletion was prevented" instead.

Tyring to write a test to cover this case I found that obstructed files are (correctly) detected as local modifications in the work tree. Thus they trigger the pre-condition check for local modications and 'got merge' will not even start to do any work in the presence of obstructed files.

Additional testing by Thomas Adam. ok tracey