Add option Set/Unset Extraction Conservative Types.

Extracted code need not preserve typing relations (e:t) from the source code.
This may be a problem as the extracted code may not implement the intented
interface. This option disables the optimisations which would prevent an
extracted term's type to be its extracted source term's type.

At this point the only such optimization is (I think) removing some dummy
λ-abstractions in constant definitions.

Extraction Implicit is still honored in this mode, and it's mostly necessary
to produce reasonable types. So in the conservative type mode, which
abstractions can be removed and which can'tt is entirely under the user's
control.

git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/coq/trunk@15762 85f007b7-540e-0410-9357-904b9bb8a0f7

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