replace usage of os.popen() with util.popen()
To make this possible, I added a mode parameter to both implementations of
util.popen(), defaulting to 'r' (as it does in the Python stdlib).
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adding changesets
transaction abort!
rollback completed
killed!
.hg/00changelog.i .hg/journal.branch .hg/journal.dirstate .hg/requires .hg/store .hg/store/00changelog.i .hg/store/00changelog.i.a