In here will go some basic utilities I need to rewrite for searching
for words with wildcards, eg ..b..[fs]..ing  or  gin.e.s*

Some patterns lend themselves to efficient implementation by dawgs
but for others you might as well use general purpose regexps and
just scan the entire wordlist.   I guess just walking the dawg is
still faster than reading a text file so we might as well stay with
dawgs for everything.