New functions to interact with tables and XML files.

Plus removed old ones and tmp file usage. Grouping is not applied
properly yet.

Refs #7557
Updated function to apply grouping.

Not working for group workspaces yet.

Refs #7557
Refactored applyGroupingToWS and made it to work with groups.

Refs 7557
Additional check for AsymmetryCalc.

Normally, this shouldn't happen, but it will help to identify problem
when it does.

Refs #7557
Don't fill up pair combo-boxes manually when filling table.

This will be done in a slot, when group table is changed.

Refs #7557
Merge branch 'feature/7557_muon_rm_tmp_file' into develop