[SVNMERGE][PATCH] handle -r X-Y, where X > Y

[Madan U Sreenivasan]

[[[
Accept -rX-Y, for all svnmerge commands, where X > Y.
Before this patch, empty RevisionSet()s were created when X > Y.

* contrib/client-side/svnmerge_test.py
    (TestCase_RevisionSet.test_reverse_order_input_string): New test. Try
     creating a RevisionSet() with a string range, in descending order.

* contrib/client-side/svnmerge.py
    (RevisionSet.__init__): Sort the input revision range before filling in
     RevisionSet._revs.
]]]
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