#49 Syntax highlighting for Haskell (needs patch from 1458834)

[Michael Karcher]

This .jsf file adds syntax highlighting for haskell.
It's only known bug is that nested comments only work
up to two levels of comments. It has been tested
against many difficult cases, for example the examples
in the Haskell Report's Lexical Structure chapter.

This syntax needs the mark support from #1458834, as
well as the strings-unescape-support from bug #1458842
to match a buffer containing a single backslash.

[Michael Karcher]

Syntax highlighting for Haskell