[Updated Patch] Core.ops pod, misc cleanups, and gcc -Wall

I've updated my last patch and split it into three pieces.  It's all 
fairly trivial.  First, some simple POD fixups to core.ops.  Second,
a few minor code tweaks to silence a few compiler or lint warnings.
Third, a change to the makefile to turn on -Wall and (optionally)
-pedantic for gcc users.

Here they are (attached):

-- 
Josh Wilmes  (josh@hitchhiker.org) | http://www.hitchhiker.org

• [Updated Patch] Core.ops pod, misc cleanups, and gcc -Wall by Josh Wilmes
• Re: [Updated Patch] Core.ops pod, misc cleanups, and gcc -Wall by Dan Sugalski