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This methods were dead code since the 'function' class declares
'setParametrization' as non-virtual.

Instances of 'parameters' must now be fully initialized upfront.

Suggested by Romain Pacanowski.

Reported by GCC -Woverloaded-virtual.

Fixes a regression introduced in
e66c9fe3.

Previously the 'ptr' interface was a home-made struct that was playing
nice with the python interface. When it was converted to
'std::shared_ptr' the python interface was broken. Now everything works
again in the same fashion.