Update and extend ufc_expression

[michalhabera]

This PR updates signature for ufc_expression tabulation kernel to use ufc_tabulate_tensor_float32, ufc_tabulate_tensor_float64, etc. (shared signature with ufc_form).

More information is added to ufc_expression to allow rank-1 expressions in dolfinx, i.e. Expressions containing UFL Argument. This is useful to build point-wise operators, see dolfinx PR.

[michalhabera]

This change is unrelated, but makes complicated kernels more readable.

[jorgensd]

Isn't this PR missing apply_dof_transformations for the more exotic finite elements (N1 curl, N1 div)?

[michalhabera]

Isn't this PR missing apply_dof_transformations for the more exotic finite elements (N1 curl, N1 div)?

This is responsibility of kernel caller, right? My understanding is dof transformations would be called in dolfinx after tabulation kernel. But I did not add any example which would needs_facet_permutations == True into dolfinx tests yet.

[jorgensd]

Isn't this PR missing apply_dof_transformations for the more exotic finite elements (N1 curl, N1 div)?

This is responsibility of kernel caller, right? My understanding is dof transformations would be called in dolfinx after tabulation kernel. But I did not add any example which would needs_facet_permutations == True into dolfinx tests yet.

Sorry, I put this comment on the wrong PR, was meant for the dolfinx one.