Remove some testing code from translate class
Improve comments
Change histogram load behavior
New Median Filter tool

Very helpful tool, and cleverly implemented as well.  Histograms are
used instead of a traditional median technique, which removes the need
for any kind of sort algorithm.

Also, this change includes some major changes to the maximum and median
filters.  (They have been reworked into the existing median code.)
Menus have been reorganized accordingly.