- allocate/free tags.
Not tested.

OK - test blockMesh with cyclics
unitTestCases/singleCyclic/

OK - test cyclics sequential running.
unitTestCases/singleCyclic/

- test decomposePar
fails on channel395-splitCyclic

OK - FaceCellWave
    unitTestCases/twoCavityCyclicForWallDistance/

OK - non-parallel finite volume : channelFoam
    unitTestCases/channel395-splitCyclic vs. channel395-dev

OK - parallel finite volume with processorCyclic: channelFoam
    unitTestCases/channel395-splitCyclic vs. channel395-dev

OK - preProcessing/foamUpgradeCyclics

OK - gamg - sequential.
Tested on channel-395 with GAMG.

- initTransfer in GAMGprocessorInterfaces using nonblocking+tags
untested.

- gamg parallel.


- test createPatch pointSync
- pointFields on cyclics. volPointInterpolation.
- jumpCyclics
- fanFvPatchField
- activeBaffleVelocity
- work out overlapping communication for PstreamBuffers.
  Different tag?
- fvMeshDistribute to split processor patches into ones with different
separation.
- fvMeshSubset
- kivaToFoam/readKivaGrid.H sorts cyclics (but in incorrect order?)
- grep for size()/2
- pointEdgeWave (maybe through inversePointDistanceDiffusivity?)
- regionSplit
- scotchDecomp
- isoSurface.C
- referredCellList.C
- renumberMesh
- work out scheduled communication?

compile: