adopted tests for adding summary table for logregr and linregr
updated input tests
revised input tests for cluster linregr
updated cluster linear R file
fixed R and added null data
added output tests for cluster logregr
investigating a failure of cluster logrgr
cluster logregr input tests
All output tests passed
Removed the unneeded input answer files
Removed unneeded input answer files
robust linregr test cases
robust linregr input test
Updated robust linregr tests.
updated robust logregr test cases
update robust logregr tests
minor fix
deleted bad dataset log_wpbc
Made the old robust tests for logistic work

Added the utility function grouping.calculation to help the grouping
computation.
Removed some debuging code