bug#5122: Mismatched parentheses when dealing with huge buffercontent

[MON KEY]

For really large groups of parens of type `mismatch-maybe' would it be
possible/reasonable/faster to do a check/balance to the nearest pair
of parens relative
the first 10 Catalan numbers e.g. something like this (or his brethren):

(URL `http://www2.research.att.com/~njas/sequences/A000108')
(URL `http://www2.research.att.com/~njas/sequences/table?a=108&fmt=4')

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