updated README; added NOTICE.TXT;
oops also renamed README should have been part of last commit;
code cleanup en-masse for plate SCADs; added default module params to every necessary top-level module;
added scad/plates - entire official PrismX printed BOM in 13 plates;
fixed syntax error in p09.scad; updated dependencies for p12; updated NOTICE;
added dist/stl/plates - print all STLs (except heatbed.stl) in this folder for complete BOM; added dist/stl/plates/heatbed.stl to .gitignore really should delete it post-build;