Standardize hash tables on SRFI-69 names and deprecate others.

Standardize hash tables on SRFI-69 names and deprecate others.

Change make-hash-table to be smarter about choosing the appropriate hash
function for a given equality predicate.

Also work around name collisions in rtlopt/rcse*.scm, and tweak the hash-table
implementation to favor SRFI-69.

Some work remains: the code around building hash-table types needs to be
re-thought: it's a little clunky and could usefully take advantage of keyword
arguments.  (These keyword arguments should also be supported by
make-hash-table.)  The hash function should be optional and use the
equality-predicate default.  The older %make-hash-table should be renamed and
exported as it's the right interface when using types.