1. Changed the API documentation for scheme_make_hash_tree, adding primitives for:
* SCHEME_hashtr_eq
* SCHEME_hashtr_equal
* SCHEME_hashtr_eqv
2. Changed direct uses of scheme_make_hash_tree to use these enumed values.
3. Fixed bugs in documentation
4. Defaults to racket/interactive (and racket/gui/interactive) if there is nothing in the config file