better i18n for join, uniq, etc.

[Paul Eggert]

I installed the attached patches to GNU Coreutils so that join and uniq 
support multi-byte characters better out-of-the-box. This uses Gnulib's 
new mcel module which makes for simpler multi-byte processing than 
what's in Fedora's i18n patches for Coreutils. (I also hope it's faster, 
though I haven't tested this.)

The idea is to continue this process of using mcel for the other 
programs where vanilla Coreutils doesn't conform to POSIX in multi-byte 
locales.

The key patch is 0009. Patch 0010 brings in the Fedora tests for join 
and uniq in multi-byte locales; these tests pass for me.

Some work is still needed for ignoring case in join and uniq. As I 
understand it, the Fedora patches don't support 'uniq --ignore-case' in 
multi-byte locales. They do support 'join --ignore-case', though they 
ignore it in the simple-minded way that GNU diff does (except diff 
lowercases first whereas Fedora join uppercases first; although neither 
approach is perfect isn't lowercasing better?).

Comments welcome. If the idea isn't a good one we can back out the 
patches. But I hope this can move forward.

0001-maint-prefer-c_isxdigit-when-that-is-the-intent.patch
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0002-digest-omit-unnecessary-b2sum-includes.patch
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0003-maint-move-field_sep-into-separate-module.patch
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0004-maint-include-ctype.h-selectively.patch
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0005-maint-port-to-oddball-tolower.patch
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0006-dircolors-assume-C-locale-spaces.patch
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0007-stdbuf-port-to-oddball-toupper.patch
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0008-test-allow-non-blank-white-space-in-numbers.patch
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0009-join-uniq-support-multi-byte-separators.patch
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0010-maint-copy-join-uniq-tests-from-Fedora.patch
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0011-maint-pacify-make-syntax-check.patch
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