remove redundancy in documentation of exec

exec's behavior is determined by the count of items in LIST, and
not by whether it's an array.
t/loc_tools.pl: find_locales() Don't destroy callers ENV

This code was recently moved from lib/locale.t to a new file essentially
unchanged, so that it could be common code.  It deletes several
environment variables, such as PATH,  to avoid interference with going
out and looking at the locales.  In lib/locale.t, those environment
variables are not needed again, but that isn't true of all the callers.
The solution is simply to localize the removal.

This should fix [perl #121106], but there remain test failures there.
regcomp.c: White-space only

Properly indent 9 lines.  This makes it easier to see the logic flaws to
be fixed in the next commits.
regcomp.c: Process all POSIXes in [...] under /l

Commit 31f05a37 introduced a regression in which if you have something
like /[\s\d[:punct:]/, all but the final class were ignored.  This was
due to initialization happening every time through the loop, instead of
the first time needed.
Clarify op_free documentation
lib/locale.t: Better debug information

This adds a couple of lines of information, and sorts some other output
locale.c: Fix failure to find UTF-8 locales

Commit 119ee68b changed the method to determine if a locale is a UTF-8
one to a method that was usable on more platforms, by using the C99 libc
function mbtowc().  I didn't realize that there needs to be a special
call to this function preceeding the main call to make sure it is in the
initial state.  This commit fixes that.

In looking at the results from several different platforms, I decided it
is best to use nl_langinfo() in preference to mbtowc() when available,
and only use mbtowc() if nl_langinfo doesn't exist on the platform or
fails to return a real result, which happens for some locales on Darwin.
This commit does that as well.
[perl #121104] avoid using a less sane find(1)
Optimisation for 'my $x; my $y;' -> 'my ($x, $y)'.

Brings:

  sub { my $x; my $y; return 1; }

Up to speed with:

  sub { my ($x, $y); return 1; }
perldelta for c23547d5c6
ensure we have a reference when we call SvRV()
perldelta for e4c0574e9d
[perl #121068] Mention HTML::FormHandler in perl5200delta

A patch has been submitted.
perl5200delta: Glib has been fixed
op.c: Consistent spaces after dots in apidocs
perldelta for c4cf781e24ac2
perl5200delta: Mouse has been fixed
perl5200delta: Tk has been fixed
Update Digest-SHA to CPAN version 5.86

  [DELTA]

5.86  Thu Jan 30 08:24:28 MST 2014
  - improved the performance of hexadecimal output functions
    -- ref. 'shahex' in src/sha.c
    -- thanks to Thomas Drugeon for ideas and test script
move RXf_NOSCAN from extflags to intflags as PREGf_NOSCAN

Includes some improvements to how we dump regexps so that when a regexp
is for the standard perl engine we also show the intflags for the engine