[CFT] Unicode collation string and reworked locale definitions

Hi all,

I have been working for a while on bringing in Unicode string collation
support by merging code from Illumos (by Garrett D'Amore who kindly made sure
his work was made under BSD license) and Dragonfly (by John Marino), and some
ancient work done on FreeBSD by edwin_at_ but never merged.

The result is available in the projects/collation branch.

As a result of this work, is:
- Locales are now generated with the new localedef(1) tool from CLDR POSIX files
- The generated files are now identified as "BSD 1.0" format
- Only "BSD 1.0" locales files are now read, all other version will be set to
  "C"
- The localedef(1) tool has been imported from Illumos and modidied to use
  tree(3) instead of the CDDL avl(3)
- A set of tool created by edwin_at_ and extended by marino_at_ for dragonfly has been
  added to be able to generate locales
- Given our regex(3) does not support multibyte yet (actually it does not
  support some single-byte codeset) it has been forced to always use locale C
- Remove colldef(1) and mklocale(1)
- Finish implementing the numeric BSD extension for ctypes
- Add a bunch of new locales: some arabian locales, hebrew locales, some
  regional locales, etc.
- Make a bunch of ISO-8859-1 locales simple aliase on ISO-8859-15 where it makes
  sense
- Add short version of locales
- Add _at_euro aliases on the locales where that make sense

Please test the branch and report issues.

Note that yes that means the COLLATION_FIX patch on glib2 will not be necessary
anymore
and yes the icu patch on postgresql will not be necessary anymore

Best regards,
Bapt