For no particularly good reason, there were two functions that converted
and array of counts to an array of offsets: ConvertNumComponentsToOffsets
and ConvertNumIndicesToOffsets. These functions were identical, except
one was defined in ArrayHandleGroupVecVariable.h and the other was
defined in CellSetExplicit.h.
These two functions have been consolidated into one (which is now called
ConvertNumComponentsToOffsets). The consolidated function has also been
put in its own header file: ConvertNumComponentsToOffsets.h.
Normally, backward compatibility would be established using deprecated
features. However, one of the things being worked on is the removal of
device-specific code (e.g. vtkm::cont::Algorithm) from core classes like
CellSetExplicit so that less code needs to use the device compiler
(especially downstream code).
Part of this change removed unnecessary includes of Algorithm.h in
ArrayHandleGroupVecVariable.h and CellSetExplicit.h. This header had to
be added to some classes that were not including it themselves.