Fix expression -Werror #216
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Fixes compilation warnings for expressions (and corner case of multi-point dofs).
The fix basically involves a use of FE table of type "quadrature".
This was previously skipped and functions on Quadrature FE space were accessed directly avoiding a loop over canonical array
{0.0, 0.0, ...,0.0, 1.0, 0.0, ..., 0.0}. This is a special optimisation which could anyway be performed by a good compiler and-ffast-mathflag.