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"at/old operator unused" is now a warning not an error.

See merge request !42

The warning can be disabled by a debug flag.
The bench was changed so as to accept examples that **should** output
warning but not fail (this category did not exist, it does now) and
label_scope has been switched to it.

Ce bench update

See merge request !39

Added debugging for driver's transformations

See merge request !38

This closes isse #179

This does not fix #183, just prevents the failure. TBC.

Resolve "Reloading should interrupt running provers"

Closes #174

See merge request !36

interrupt is now properly handled by why3server

Fix ce-bench for diffs between platforms

See merge request !34

This makes Timeout and Unknown equivalent and remove the diff on floats
that differs on moloch and CI.

subst can make constant definitions recursive, making them
fail termination check. Convert such definitions into axioms
on the fly. Tentative fix for #195.

use variant inference from Decl to prove termination
for pure recursive functions without variant.

For a measured time of 0.49 second, a prover would only get 1 second to
replay the proof, i.e., half of the expected 1.98 seconds. The time limit
is now rounded to nearest to prevent this underestimation on fast proofs.

C extraction cosmetics

See merge request !32

Naming proposition for expl of transformations with arguments #191

See merge request !28

the beginner transformation `split_vc` is now using `introduce_premises`
followed by `subst_all`, instead of `simplify_trivial_quantification`
followed by `introduce_premises`.

following Andrei's suggestion, instead of `subst_all` we instead substitute
only the symbols that (1) were introduced earlier and (2) do not have
any attributes `[@model...]` so as to keep symbols present in the initial
code.

Fix issue #190

Closes #190

See merge request !27

This puts explanations on goals generated by some transformations with
arguments. Ideally, no goals should be without explanations.

Exceptions from transformations are of two kinds:
- fatal exception which are then raised into a popup in the ide
- normal exception which appears in the message view