Update to Unicode 6.1.0.

  src/code/unidata.lisp:: Update Unicode version.

  src/tools/build-unidata.lisp:: Update Unicode version and update for
  change of format of NameAliases.txt.

  src/i18n/unidata.bin:: Updated with new data.

  src/general-info/release-20d.txt:: Updated.

  src/i18n/BidiMirroring.txt:: Updated to Unicode 6.1.0.
  src/i18n/CaseFolding.txt:: Updated to Unicode 6.1.0.
  src/i18n/CompositionExclusions.txt:: Updated to Unicode 6.1.0.
  src/i18n/DerivedNormalizationProps.txt:: Updated to Unicode 6.1.0.
  src/i18n/NameAliases.txt:: Updated to Unicode 6.1.0.
  src/i18n/NormalizationCorrections.txt:;
  src/i18n/SpecialCasing.txt:: Updated to Unicode 6.1.0.
  src/i18n/UnicodeData.txt:: Updated to Unicode 6.1.0.
  src/i18n/WordBreakProperty.txt:: Updated to Unicode 6.1.0.
  src/i18n/tests/NormalizationTest.txt:: Updated to Unicode 6.1.0.
  src/i18n/tests/WordBreakTest.txt:: Updated to Unicode 6.1.0.