Added build option for syntax highlighting, with *optional* dependency on highlighting-kate.

+ pandoc.cabal includes a flag, 'highlighting', that causes a dependency
  on highlighting-kate.
+ if Setup.hs detects this dependency, it copies templates/Highlighting.yes.hs
  to Text/Pandoc/Highlighting.hs.  Otherwise, it copies templates/Highlighting.no.hs.
+ The HTML writer imports this new module instead of Text.Highlighting.Kate.
  The new module exports highlightHtml, which either uses highlighting-kate to
  perform syntax highlighting or automatically returns a failure code, depending
  on whether highlighting support was selected.
+ --version now prints information about whether syntax highlighting support is compiled in.


git-svn-id: https://pandoc.googlecode.com/svn/trunk@1221 788f1e2b-df1e-0410-8736-df70ead52e1b

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