rm CallReducer
mv CallElementProxy in its own file
added GroupedCallProxy
refining GroupedCallProxy
using GroupedCallProxy in Gatherer
simplify CallProxy now that it only deals with non grouped data
rationalize what 0 means as result of get_result
minor omissions
moved LazyGroupedSubsets in itw own file
started to work onb hybrid evaluation #95
some more hybrid evaluation #95
some more hybrid eval work
not using LazySubset yet
fix can_simplify
less debugging msgs
fix hybrid call simplifcation. #95
better substitution in hybrid call. #95
not yet using hybrid evaluation
Merge branch 'hybrid3'