Make OD_SET_MV_LEVEL_{MIN|MAX} checks more generic.
Make OD_SET_MV_LEVEL_{MIN|MAX} checks more generic.

This makes them use the #defines from internal.h to check the
 bounds of legal values.
Unfortunately, it's not quite as easy to make the Doxygen
 documentation in include/daala/daalaenc.h automatically update,
 since OD_MC_LEVEL_MAX is a non-public symbol, but that's perhaps a
 good reason for these CTLs to go away in favor of the more-general
 complexity knob.

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