hash: read/print consistency regression.

TXR 188 makes a slight mess of the #H notation. An :eql-based
hash table prints as #H(() ...), but when that notation is
read, it produces an :equal-based hash table. No aspect of
this situation was intended; the intent was that the notation
stays the same as before, and just the hash function changes
to make :equal-based the default. Let's just go with this
and have #H(() ...) denote :equal-based tables.

* hash.c (hash_print_op): Print an :eql-based for eql-based
hash tables, and nothing for equal-based ones. In
compatibility mode with 188 and older, reproduce the old
behavior, rendering equal-based tables with :equal-based and
the absence of a symbol for eql-based.

* txr.1: Updated places that touch on :equal-based and
added compatibility notes.

* tests/009/json.expected: updated, since equal-based hash
tables now print without :equal-based keyword.

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