Crossword v1.70

v1.61 - added code to load rebus GRBS and RTBL entries if present.  these are not

        handled now but are stored in puzzle storage for future use

v1.62 - document REBUS section in the load puzzle routines

        process RTBL entries and store in puzzle storage for future enhancement

v1.63 - do not save empty grid if no entries for puzzle

v1.64 - crank support added for puzzle lists by Macoy Madson

        crank enhancement to letter selection for puzzles by Macoy Madson

v1.70 - public release