Making note of interface change work in README and TODO
Changing internal function, parse and eval now use plot_pair(s), old types removed.

This breaks many of the c unit tests, however the scheme ones are still
happy (all except for the quoted sexpr case which has not yet been
implemented)
Adding quoting of lists
Renaming syntactic to 'form' in preparation for non-syntactic forms (functions with new interface)
Adding new header `control` (for r7rs 6.10), Adding dummy procedures for `apply`, `map` and `for-each`