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Bench reestablished

Why3 now looks for a %l/{coq,pvs}/version file to check which version of a
prover was used to compile realizations. In particular, there is no longer
any Config.compile_time_support variable set once and for all.

When many equalities have to be rewritten, using the existing rewrite transformation repeatedly wastes a lot of time in declaration and task construction.
The rewrite_list transformation rewrites all equalities first and then builds the new declarations and tasks only once.

This reverts commit 9629e273.

The pattern-matching construct in the logic is now systematically named
"Tcase" in constructors (Ptree.Tmatch -> Tcase). The one in the
programs (supporting exceptions) is now systematically named "Ematch"
(Expr.Ecase -> Ematch, Dexpr.DEcase -> DEmatch). They are now homogeneous
with the other constructors: Term.Tcase, Dterm.DTcase, Ptree.Ematch,
Mltree.Ematch. Smart constructor Expr.e_case was renamed accordingly.

Also, comment out a seemingly useless invariant in
examples/topological_sorting.mlw detected by the new check.

Since the same name cannot be reused for several theories in a single
file, the line-number suffix can be scrapped. This makes it easier to
reference a given theory from a human-written documentation.

The final underscore is kept to avoid ambiguities.

RFC 3986 states that the allowed characters are:

   fragment      = *( pchar / "/" / "?" )
   pchar         = unreserved / pct-encoded / sub-delims / ":" / "@"
   pct-encoded   = "%" HEXDIG HEXDIG
   unreserved    = ALPHA / DIGIT / "-" / "." / "_" / "~"
   sub-delims    = "!" / "$" / "&" / "'" / "(" / ")"
                 / "*" / "+" / "," / ";" / "="

- use the default editor if no specific editor known
- keep the former result after edition, although obsolete

Note that the "default_editor" setting is moved from the IDE config to
the main config section