sockets: ipv6 address condensing rewrite.

* share/txr/stdlib/socket.tl (sys:in6addr-condensed-text):
Rewrite with regex based implementation that formats
the number without condensing. This one has better
semantics in that it finds the longest run of 0.0..0
to replace, rather than the leftmost. Ignoring this
semantic difference, it also has better average performance on
pseudo-random addresses, with similar performance on
addresses with long condensable 0's. The original algorithm
has a significantly poorer average case on random addresses,
but better best case on condensable zeros like 1::1.
The new algorithm could improve further with future work to
make regexes faster.

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