prim notations backtrackable, their declarations now in two parts (API change)

 The first part (e.g. register_bignumeral_interpretation) deals only with
 the interp/uninterp closures. It should typically be done as a side
 effect during a syntax plugin loading. No prim notation are active yet
 after this phase.

 The second part (enable_prim_token_interpretation) activates the prim
 notation. It is now correctly talking to Summary and to the LibStack.
 To avoid "phantom" objects in libstack after a mere Require, this
 second part should be done inside a Mltop.declare_cache_obj

 The link between the two parts is a prim_token_uid (a string), which
 should be unique for each primitive notation. When this primitive
 notation is specific to a scope, the scope_name could be used as uid.

 Btw, the list of "patterns" for detecting when an uninterpreter should
 be considered is now restricted to a list of global_reference
 (inductive constructors, or injection functions such as IZR).
 The earlier API was accepting a glob_constr list, but was actually
 only working well for global_reference.

 A minimal compatibility is provided (declare_numeral_interpreter),
 but is discouraged, since it is known to store uncessary objects
 in the libstack.

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