revert: use "discard"/"revert" verb when reverting interactively (
issue5143)
Instead of "record this change to 'FILE'?" now prompt with:
* "discard this change to 'FILE'?" when reverting to the parent of working
directory, and,
* "revert this change to 'FILE'?" otherwise.
run-tests: add support for RTUNICODEPEDANTRY environment variable
based on
73e4a02e6d23