Fixed tree view filtering to work with the actual filters. **No Requirement Found message is behind**
Fixed merge conflict
Started to implement checking for duplicate filters
Merge branch 'dev-set3-filter' of github.com:333fred/wpi-suite-tng into dev-set3-filter
Added duplication check on saving filters
Merge branch 'dev-set3-filter' of github.com:333fred/wpi-suite-tng into dev-set3-iteration5