fix System.Time, remove 'Read' instances for now as they tickle the optimizer in a bad way.
fix System.Time, remove 'Read' instances for now as they tickle the optimizer in a bad way.

darcs-hash:20070608214922-1a7c6-d552aa47eab2dcf38c768024b76a1ec487aed4dc

jimcrayne/jhc,jimcrayne/jhc,jimcrayne/jhc,jimcrayne/jhc