ENH: GAMGAgglomeration: optional name. Fixes #3332
Summary
Optional name for agglomeration so different agglomeration methods can be used for different variables.
Resolved bugs (If applicable)
Details of new models (If applicable)
New entry name inside fvSolution entry:
name my_agglomeration;
Risks
The name is the one the agglomeration table is stored under so with multiple names there will be more storage.