Add experiment with nested code blocks.
Factor out 'link,' from 'header,' and ':noname'.
Add >name to extract the name string (without flag bits) from a word.
Add Forth12 n>r and nr>.  Also '.s"' to ease debugging.
Add crude support for multiple vocabularies.
Add (most of) the Forth94 'Search-Order' wordset.
Introduce a special vocabulary used in compilation state.
Add 'hide' and 'compile-only'.  Split 's"' into two separate interpretation
and compilation (compile-only) words.