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Drop ref/default, update!/default

I suggest dropping hash-table-ref/default and hash-table-update!/default. These gain little in convenience, and don't serve any aim of the SRFI so far as I can tell.

Also note that the current specification is not correct:

   Procedure: hash-table-ref/default hash-table key default -> value

   Equivalent to (hash-table-ref hash-table key (lambda () default)).

Consider default = ((lambda (x) (x x)) (lambda (x) (x x))). The program (hash-table-ref ht k (lambda () default)) diverges only when the key k is not found. The program (hash-table-ref/default ht k default) always diverges.