ignore .bak files
handle Ctrl+C and show proper usage
try to clean readme a bit
Merge branch 'stderr1' of git://github.com/AtKaaZ/wac into AtKaaz-stderr1
Minor code and README clean-up

* Wrap code at 85 chars
* Declarations, definitions and initializations at top of the function/program
* Let main() be the first defined function in the file
* testall.bat doesn't do much more than printcol.bat, so rm it for now; we should
  probably add a more sophisticated test later, such as one that would employ both
  STDOUT and STDERR
* Words and formulations