revert: drop requirement to use -r to revert with two parents
This reduces documentation confusion between the need to:
a) hg revert -a -r . (drop all changes from a merge)
b) hg up -C . (drop the second parent entirely)
Currently revert is one of two commands (the other being tag) that
still complains about uncommitted merges, dating from its former use
of a generic defaultrev function that aborted.
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