[MERGE] [Bug #148908] Return an error if the revisionspec contains merge revisions, but the log formatter doesn't support them.

[Kent Gibson]

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This is a pretty straight forward fix for #148908.
It adds a precondition check that the revision specs for log
formatters that don't support merge revisions are mainline revisions.
The precondition check has a very minor performance hit (one or two
dict lookups) on logs with formatters that don't support merge
revisions and where a revisionspec is provided.
I toyed with the idea of handling the exception raised by
_filter_revision_range instead, but this solution looked cleaner to me.

Cheers,
Kent.
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