doco setlocale

[Kevin Ryde]

A bit of polish to propose for the setlocale documentation.

        * posix.texi (Locales): Clarify setlocale a bit, list all categories,
        cross reference to libc.

I think it's better to refer to the libc manual then the gettext one,
since setlocale lives in libc and it's there that stuff like strftime
gets influenced.


Locales
=======

 - Scheme Procedure: setlocale category [locale]
 - C Function: scm_setlocale (category, locale)
     Get or set the current locale, used for various
     internationalizations.  Locales are strings, for instance `sv_SE'.

     If LOCALE is given then the locale for the given category is set
     and the new value returned.  If LOCALE is not given then the
     current value of the category is returned.  CATEGORY should be one
     of the following values

      - Variable: LC_ALL
      - Variable: LC_COLLATE
      - Variable: LC_CTYPE
      - Variable: LC_MESSAGES
      - Variable: LC_MONETARY
      - Variable: LC_NUMERIC
      - Variable: LC_TIME

     A common usage is `(setlocale LC_ALL "")', which initializes all
     categories based on standard environment variables (`LANG' etc).
     For full details on categories and locale names *note Locales and
     Internationalization: (libc)Locales..

posix.texi.setlocale.diff
Description: Text document