[MERGE] Extend --lsprof-file to implicitly support files starting with callgrind.out

[Ian Clatworthy]

Aaron has pointed out that KCacheGrind's Open Dialog filters by default
on files starting with callgrind.out. This patch dumps data into the
format expected by KCacheGrind when a profiling output filename with
that pattern is passed to the --lsprof-file option.

The relevant documentation in the various places is also updated by this
patch.

Ian C.
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