Maintaintership of HaLeX

[Jan Rochel]

Hello.

The current version (1.2) of HaLeX does not build on my machine
(ghc-7.6.3). The fix is very simple*, but the package maintainer has not
reacted on any of my emails during the last couple of months. I'd be
willing to take over maintainership, if people agree that this is the
best course of action. Otherwise I'd upload an additional fixed variant
of the package.

Greetings,
Jan

* add assumption (Eq st) on lines 80 and 104 of file
  HaLeX_lib/Language/HaLex/Fa2RegExp.hs