revert: add prompt before undeleting a file in -i (
issue6008)
This adds a prompt that asks whether or not a removed file is to be undeleted
in `hg revert -i`.
Differential Revision: https://phab.mercurial-scm.org/D5803
#
# Avoid interference from actual test env:
unset HGTEST_JOBS
unset HGTEST_TIMEOUT
unset HGTEST_PORT
unset HGTEST_SHELL