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IProductWRTSumFac implementation for Segs/Quads/Hexs

Chi Hin Chan requested to merge IProductWRTBaseSumFac into master

An operator class for IProductWRTBase sum-factorisation is created in IProductWRTBaseSumFac.hpp.

A switch-statement in IProductWRTBaseSumFac.hpp selects the appropriate shape with the kernels implemented in IProductWRTBaseSumFacKernels.hpp. The following shapes are implemented in this MR,

  1. Segments
  2. Quadrilaterals
  3. Hexahedrals

The "Collections-based" optimisation for collocated bases is also implemented in IProductWRTBaseSumFacKernels.hpp using a series of if-statements, although proper profiling is yet to be conducted.

A test case IProductWRTBaseSumFac is also added and working properly.

Edited by Chi Hin Chan

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