Update to Unicode 6.0.0.

code/unidata.lisp:
o Update unicode version to 6.0.0
o Add pointer to build-unidata.lisp.
tools/build-unidata.lisp:
o Update unicode version to 6.0.0
o Print out directory path so we can see where we're getting the data
  from.


i18n/CaseFolding.txt
i18n/CompositionExclusions.txt
i18n/DerivedNormalizationProps.txt
i18n/NameAliases.txt
i18n/NormalizationCorrections.txt
i18n/SpecialCasing.txt
i18n/UnicodeData.txt
i18n/WordBreakProperty.txt
i18n/tests/NormalizationTest.txt
i18n/tests/WordBreakTest.txt:
o Update with new files from unicode.org.