- corrected several bugs in inlining
 - STILL, BUGS REMAINING in inlined code !!??!!

  - added interface files (.lusi) in the language, that can be compiled on their own, giving an object file (.lusic) and a header file (.h)
  - modular code generation, from Lustre to C level included.
  - nice amount of code refactoring

Moved backends in separate folders

1. moved type def in lustrespec.ml
2. moved constructor and basic functions in corelang
3. Modified eexpr with prenext quantifiers

   (to turn conditionals into merges, which yield more efficient C code)

Systematic use of the build path