Merge branch 'locale.c: Improve newcollate' into blead

newcollate is called when LC_COLLATE is set to a new locale. This series
of commits improves its operation

Some platforms require LC_CTYPE and LC_COLLATE to be the same locale in
order to operate properly. These commits now bring LC_CTYPE into sync
with LC_COLLATE for the duration of the calculations.

More and better debugging statements are added

Memory is allocated when a string is collated. The amount is roughly a
linear function of the string length, varying depending on the locale.
To save some recalculations, perl calculates and saves coefficients for
the current locale's equation once, revising them if necessary. Prior to
this commit, this somewhat expensive calculation was done every time the
locale changed. Now it is deferred until the first time it is needed.

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