ModuleSpace_R_compl:

Make some arguments implicit.

Finite_dim_R:
Add many local definitions to ease reading.
Make some arguments implicit.
Rename dual_is_linear_mapping -> dual_lin_map.
Add def bidual_basis, bidual, bidual_nat_isom, predual_basis.
Add and prove dual_has_dim, dual_lin_map_{rev,equiv}.
WIP: bidual_pt_eval, bidual_nat_isom_{correct,lin_map,inj,bij},
     predual_basis_{dualF,is_basis,correct}.