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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.

Peano: allows to convert to int63 with a partial function

See merge request !19

Record with one field have a specific treatment in VC generation. The
combination of this with the projections of first and last elements of
arrays (that are inside records with one field) were not considered. Hence,
the necessity of this hackish solution which treat specific case of
First and Last.

This is unfortunately not compatible with lablgtk2.

This reverts commit d0ef3542.

hybrid eliminate_if

See merge request !80

we continue to use the duplicating version of eliminate_if_term for
atomic formulas but we replace if-then-else with epsilon in Tlet and Tcase

Also add a command to fill the command entry