Import of one-true-awk.

Original source is availale from:
http://cm.bell-labs.com/cm/cs/awkbook/

README.DELETED lists the files that were removed for this import.

The vendor import was done by:

	cvs import -m "Import of awk 20050424" src/contrib/awk20050424 \
	    BELL_LABS awk_20050424