New tests for DecisionTables with multiple func columns with same name. (One ignored)
First refactoring towards allowing DecisionTables with multiple func columns with same name.
DecisionTables with multiple func columns with same name work now.
remove duplication
renames in FuncStore and changed visibility
multiple coulmns with same var name
rename FuncStore to ColumnHeaderStore, use it for vars as well
removed unnecessary import
Merge pull request #253 from ggramlich/master

Fix for issue 101 DT: multiple setter call do get value from the last column