P0 Template Specializations module

Template specializations of the P0 class.

Specialization	Description
P0<SpatialMatrix<Scalar>, Mesh<Context::Local>>	Full rectangular matrix range with interleaved row-major components.
P0<SpatialMatrix<Scalar>, Mesh<Context::MPI>>	Distributed full matrix range with expanded scalar ownership and ghost maps.
P0<Range, Mesh<Context::Local>>	Real or complex scalar/vector local-mesh discontinuous piecewise constant space.
P0<Range, Mesh<Context::MPI>>	Scalar or vector-valued distributed-mesh discontinuous piecewise constant space.