a slightly different representation of coercions
(using trees instead of lists)
bench files for coercions

Now adding the very same coercion is accepted (useful for multiple/transitive use imports)

Minor

Registered exceptions in file coercion.ml

IDE option to show coercions in formulas.
By default this option is set to true

Composition of coercion functions is now labelized

Started a module to contain operations specific to coercions

div -> ( / )

Minor changes in compile.ml and ocaml_printer.ml

Adding support in drivers for Zarith and the ocaml.mlw file

Working with the extraction driver

basically, we want to its_fragile to be true whenever
a value of the type can be broken or contain a broken
component that cannot be reached from type parameters
or regions (a free type that does not commit its fields
on construction can accomodate a broken snapshot field).

Partial applied constructors are eta-expanded

Added support for translation and printing of lambdas
in an expression. This can be done via partial application
or by defining a [fun -> ...] expression explicitly

Ghost fields removed from record types definitions

The creation of a new record is now properly
printed into the OCaml syntax