Bumped dependency version of criterion.
Revert "Now I rely on code that I added to cmdtheline."

The author refuses to add a Word instance because for some
reason the Word instance has special problems that the Int
instance doesn't have that he choose not to explain.

This reverts commit ed57778a0f3f7c9c2755d7dee5030424b34275e8.
Wrote and tested searchVistor(T) routines in Control.Visitor.