Work in progress -- clean compiles and runs, sort of
I've made good progress today.  At this point I can parse down from a SchemaDef
through it's type and enum definitions, into a Table, through the columns of
the Table, and through the Index definitions of the Table.

However, I haven't coded and wired the parsers for the various Java* multi-line
text attributes of the SchemaDef and Table objects.  Until those are coded, I'm
in a bit of a holding pattern.  But I've spent enough time coding for tonight;
I'll deal with it tomorrow at some point.