Initial commit
Transfer to git.
Ignore built files and backups.
Rename .fs to .fth.
(To please GitHub.)
Rename docolon to enter.
Make meta compiler overwite previous output.
Makefile tweaks.
Implement does>.
Also remote unnecessary thisxt and simplify use of header,.
Word tweaks.
Add Forth standards documents: 79, 83, 94 (dpANS), and 12 (draft).
Improve see.  Now identifies xts by searching the dictionary.
Allow 'create C x ,' in meta compiler.
Add some core extension words, including some from Forth12.
Move here, base, and state from C to Forth.
Also, add 'tracing' to control tracing output when words are executed.
Provide a friendly banner when starting.
Move (s") from kernel to core.
Reimplement C primitives in Forth: branch, execute, (+loop).
Move from C to Forth: lastxt, #tib, >in.
Add Anton Ertl's paper about state smartness.
Make ' return 0 if word is not found.