[initialized
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[need license
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[added hackage requirements
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[add description to module
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[cleaned up and added documentation
ekmett@gmail.com**20070713030253] 
[fussy documentation fixes and adding most of the mtl
ekmett@gmail.com**20070713053346] 
[clean up
ekmett@gmail.com**20070713053904] 
[swapped the meaning of return and returnM, and of mzero and mzeroM
ekmett@gmail.com**20070713073620]