Start simplification and consistency fixes for fem::FiniteElement
#3502
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fem::FiniteElement
andfem::FunctionSpace
are in a bit of a mess with respect to block size, value_shape and mixed elements. It's all a bit muddled. This is a first step of several to straighten things out. This change makesfem::FiniteElement::_reference_value_shape
optional - it takes on a value only when it makes sense and when needed, i.e. not for mixed elements.