[PATCH, svnmerge] Another round of misc fixes

Hello,

really minor fixes, committed as r18012.

[[[
Miscellaneous compatibility fixes. Allow running svnmerge.main multiple
times with a single import (will be useful for the testsuite).

* contrib/client-side/svnmerge.py:
  (CommandOpts.__init__): Duplicate external data structures.
  (CommandOpts.__init__, CommandOpts._command): Avoid using 'key in dict'.
]]]

-- 
Giovanni Bajo

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