sort and LC_COLLATE: suggestions for improvement (with patch)

[Jean-Pierre Vial]

When one wants to sort a file in which letters are just codes,
not meaningfull words, the sort order obtained through LC_COLLATE
is very often inadequate.
The help suggest to set LC_ALL="C", but this is often inadequate as well
in complcated shell scripts.

I attach a small patch, which adds a global command-line option: -A
and s sub-option for use in individual keys : a
These options force the same ordering as LC_ALL="C", without tempering
any environment variable.
Numeric sorts, monthes etc. are not modified.

I hope that it may be useful for others.
You are free to use the patch as you want.

-- 
Jean-Pierre Vial

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> 
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> 
> /* Nonzero if we use  hard_LC_COLLATE*/
> static bool Use_local_collate=1;
> 
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> 
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>   bool use_local_collate;         /* =1 use the current collate function
>                                  =0 sort by ascii code, even if >128 */
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>       fputs("  -A, --all-ascii             sort by ascii numeric code (all 
> textual keys)\n",stdout);
>       fputs("  a,  sort this key by ascii numeric code (option letter for one 
> key)\n",stdout);
>       fputs("      Caution for accented letters etc. the order depends  on 
> the encoding\n      in use at file creation\n",stdout);
398c409
< static char const short_options[] = "-bcCdfgik:mMno:rRsS:t:T:uy:z";
---
> static char const short_options[] = "aA-bcCdfgik:mMno:rRsS:t:T:uy:z";
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>   {"ascii-sort",no_argument,NULL,'a'},
>   {"all-ascii",no_argument,NULL,'A'},
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< 
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< 
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<       else if (hard_LC_COLLATE)
---
>       else if (hard_LC_COLLATE && Use_local_collate && key->use_local_collate)
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<   else if (hard_LC_COLLATE)
---
>   else if (hard_LC_COLLATE && Use_local_collate)
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>       case 'a':
>         key->use_local_collate=0;
>         break;
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>   key->use_local_collate=1;
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< 
---
>       case 'A':
>         Use_local_collate=0;
>         break;
>       case 'a':
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>       case 'F':