Filters renaming and categories update

Rename some filters to give them a more concise, meaningful name. Create new categories.

Filters renaming

At some point, we probably should update/create some guideline on how to name a proxy/filter.

For each filter renamed, the following files should be updated:

• *.xml: the servermanager file declaring the proxy. This should keep a deprecated version with the previous name, inheriting the new.
• ParaViewFilters.xml: to expose new proxy in ParaView GUI.
• vtkSMStateVersionController.cxx for pvsm backward compatibility. It uses proxy name.
• _backwardscompatibilityhelper.py for python backward compatibility. It uses proxy label.
• proxy-deprecation.md to document the change in release note
• Testing/*.xml (opt): the XML test(s) using this proxy

Renaming summary

previous name	new name
GhostCellsGenerator	GhostCells
AddFieldArrays	FieldArraysFromFile
AppendArcLength	PolylineLength
AppendLocationAttributes	Coordinates
BlockScalars	BlockIds
ComputeConnectedSurfaceProperties	ConnectedSurfaceProperties
GenerateGlobalIds	GlobalCellAndPointIds
GenerateIds	CellAndPointIds
GenerateProcessIds	ProcessIds
GenerateSpatioTemporalHarmonics	SpatioTemporalHarmonics
GenerateSurfaceNormals	SurfaceNormals
GenerateSurfaceTangents	SurfaceTangents
LevelScalarsOverlappingAMR	OverlappingAMRLevelIds

Categories

Categories now support to be nested. Use this feature to reorganize current categories and add some more.

Screenshot

Documentation update

Added a page about naming proxies and deprecation.

Screenshots