Get rid of the depth argument to dfilter_macro_apply(); have an internal

routine that does all the work and that takes a depth argumen, and an
external routine that calls that internal routine with a depth argument
of 0.  The depth is only of use internally, to avoid infinite recursion.

When recursing with that routine, pass depth+1 as the depth value,
rather than passing depth and incrementing it afterwards; the latter
doesn't prevent infinite recursion.  (Thanks and a tip of the hat to
Clang Cat for catching this.)

Squelch some other (harmless) warnings from Clang Cat.

Clean up indentation.

svn path=/trunk/; revision=39838

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