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Resolve "Extracting higher-order calls"

Closes #239

See merge request !90

Resolve "Extraction of recursive polymorphic functions"

Closes #240

See merge request !89

Resolve "destruct improvement with if then else"

Closes #264

See merge request !85

This is because it might be non-reversible: we don't state that when a
given pattern is matched, the subject does not match the former patterns

Also clean Destruct.expand and make toplevel

Resolve "Questions on `replay --use-steps `"

Closes #266

See merge request !87

Since these files depend on Flocq, we are sure that Coq is at least 8.7.

This commit also removes some occurrences of 'fourier'.

New documentation on counterexamples feature

See merge request !86

Resolve "destruct improvement with if then else"

Closes #264

See merge request !84

Fixes #264

Model record

See merge request !83

Issue 259

Closes #259

See merge request !81

The projection is now recorded with its ident which allow us to rewrite
the projections in counterexamples. We use the id_string which is only an
approximation of what can be seen in the task (but it is close enough).

By default, the color used for font errors in the messages view is used
as background for precise locations of errors in source.
Perhaps, its a good idea to change the color in the future.