uses existing stack and undo features to run a WordNotifierInfo over
some number of scoring passes to gather the words seen. Seems to work
as tested from gtk version. Now need to try from android....
current dictionary. This allows us to continue to open games saved
with older code using older dictionaries while still supporting the
new format for up to 64 tiles. Old versions may crash when opening
games created by new versions, but that's probably ok.