- Bugs in partial evaluation for equalities among bool constants
  and a nice recursive call generating a stack overflow! Now solved
- Setup a timeout for z3 in seal
- Better log for seal

- real constants are hidden in Real.ml{i} module

Different parsers yet but shared process.
In case of lusi input the C backend is bypassed since the .h is generated from the lusic and no C code should be generated since it may overwrite existing manually written code

But

- program type renamed as program_t
- Initiating the lustrev tool with dependencies to z3 and seal.

[general] large modification: added machine types, a second typing phase dealing with machine types (eg uint8)
          typing was transformed as a functor and parametrized by basic types (int/real/bool)
          it can also be applied multiple times on the same program

- EMF backend now impose the optimization level to be set to 0 in order to avoid equation elimination that would render traceability difficult
- Options.ml has been split into Options.ml / Options_management.ml. Options.ml only contains references and no functions

- Addtional encapsulation of machine_code instr in a struct to enable future extension of type with more metadata.
- Improved EMF backend with META information

[bug] seems to crash with EMF backend

Impact:
- EMF backend has an extra machines argument
- specific option to avoid merge of ite constructs
- set_backend function to improve backend selection

Most code was extracted from seahorn_backend through c0f8

- allow multiple -I dir, will be used in order (first one declared
  is first used)

- when declaring a global library #open <foo>, foo is first checked
  in local folders, than in global one (install path). This
  does not apply to local libraries opened with #open "foo".

mostly a recovery of an ancient svn repo: mutations