configure - Githubissues

configure rework

bison/flex option
- require either bison or byacc/yacc, not both (done)
- relax YACC checks (done)
- canned parser, omitting bison/yacc requirement.
target artifact
- move mkdir_p.pl win32 -> util (break win32 relationship) (done: MKDIR_P)
- gr.manifest.xml
ucd data
- https://www.unicode/Public/draft/zipped
- canned source for mappings
nd++,
- move to github

adamyg / grief