Character name and properties support, from Paul Foley, slightly

modified by Raymond Toy.

Use 19f/boot-2009-03-cross-unicode-<arch> for the cross compile
script.  Use 19f/boot-2009-03-unicode-char for the bootstrap file to
initialize the unicode character structures.

bootfiles/19e/boot-2008-05-cross-unicode-common.lisp:
o Just add new slots to fd-stream here, to make it easier to bootstrap
  the utf16-extfmts code, and to select the clobber-it restart
  automatically.
o Build the initial unicode properties

bootfiles/19f/boot-2009-03-cross-unicode-ppc.lisp:
bootfiles/19f/boot-2009-03-cross-unicode-sparc.lisp:
bootfiles/19f/boot-2009-03-cross-unicode-x86.lisp:
o New scripts for cross-compiling.  Basically just calls the
  original ones in the 19e directory.

bootfiles/19f/boot-2009-03-unicode-char.lisp:
o Bootstrap file to load up the full unicode properties.

i18n/UnicodeData.txt:
o UnicodeData.txt, obtained from
  unicode.org/Public/UNIDATA/UnicodeData.txt, 2009-03-24.

code/fd-stream.lisp:
o Add new slots to fd-stream, needed by utf16-extfmts branch.

code/char.lisp:
o Define structure to hold unicode properties of each character and
  new hash table to hold the properties.
o Update CHAR-NAME and NAME-CHAR to give the character names and code,
  respectively.
o Update GRAPHIC-CHAR-P, ALPHA-CHAR-P, UPPER-CASE-P, LOWER-CASE-P,
  BOTH-CASE-P, ALPHANUMERICP, EQUAL-CHAR-CODE, CHAR-UPCASE, and
  CHAR-DOWNCASE to handle unicode characters.
o Add function REBUILD-UNICODE-DATA to update the unicode structures
  from UnicodeData.txt.