Fix a bug in the naming of binders.

The ident closure was not propagated when pretying a [uconstr] coming from a [uconstr] closure. This bug had never been reported, as far as I'm aware.
Fix: when interpreting a identifier in pretying, use the Ltac identifier substitution at the right place.

I used to change [id] to its interpretation before calling [pretype_id]. But it's incorrect: we need to use the Ltac interpretation only when looking up the rel context (where it has been interpreted previously). It would not be to use the interpreted identifier to look up the named context or the Ltac context.
Ltac names in binders: some Ltac values can be seen both as terms and identifiers.

Fixes Ergo.
Fix timing of evar-normalisation  of goals in [Ftactic.nf_enter].

All goals were normalised up front, rather than normalised after the tactic acting on previous goal had the chance to solve some evars, which then appeared non-instantiated to tactics which do not work up to evar map (most of them).
Fixing line break in test for #3559.
Not printing goal name (reinstalled by mistake in a previous commit).
Fixing printing of @eq which was apparently wrong bug fixed by MS on Wed 10.
Adapting ltac output test to new interpretation of binders.
Add a "Hint Mode ref (+ | -)*" hint for setting a global mode
of resulution for goals whose head is "ref". + means the argument
is an input and shouldn't contain an evar, otherwise resolution
fails. This generalizes the Typeclasses Strict Resolution option
which prevents resolution to fire on underconstrained typeclass
constraints, now the criterion can be applied to specific parameters.
Also cleanup auto/eauto code, uncovering a potential backwards
compatibility issue: in cases the goal contains existentials, we
never use the discrimination net in auto/eauto. We should try to
set this on once the contribs are stabilized (the stdlib goes through
when the dnet is used in these cases).
More on printing references applied to implicit arguments.
fix test-suite/success/decl_mode.v
better error message
Undo prints only if coqtop || emacs
Revert specific syntax for primitive projections, avoiding ugly
contortions in internalization/externalization. It uses a fully typed
version of detyping, requiring the environment, to move from
primitive projection applications to regular applications of
the eta-expanded version. The kernel is unchanged, and only
constrMatching needs compatibility code now.
Update test-suite files after last commit. Add a file for rewrite_strat
examples.