Effects > Edge > Edge Enhance: code cleanup
Change local variable names to prevent VB case issues

aaaarrrrgggghhhh
Effects > Artistic > Comic Book: new implementation, new dialog

Another fix for a mediocre single-click implementation.  This tool now
has its own dialog, with options for ink strength and color smudging
(which uses a median filter - not ideal, but I need to rewrite some
things in bilateral smoothing to make it amenable to outside use, and I
don't want to tackle that just yet).

This leaves just one filter in the Artistic menu still to be dealt
with...