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Entries defined in the Pcoq AST of symbols must be marshallable, because they
are present in the libstack. Yet, CAMLP4/5 entries are not marshallable as
they contain functional values. This is why the Pcoq module used a pair
[string * string] to describe entries. It is obviously type-unsafe, so
we define a new abstract type in its own module. There is a little issue
though, which is that our entries and CAMLP4/5 entries must be kept
synchronized through an association table. The Pcoq module tries to
maintain this invariant.
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