- destination dir should now work properly
 - lusic files now have a version number, to avoid nasty segfaults
   when loading lusic files created by an older compiler version
 - inlining should now work with generic nodes and generic array library
 - tests_ok_dev.list has been added that focuses on advanced (but unused !)
   features of lustrec, avoiding the large 'kind' test files 

 - global constants were not accounted for
 - no good avoidance of name capture when inlining
 - static parameters (array sizes and clocks) not handled
 - ill-typed generated expressions, when inlining array expressions

 - removed a potential source of bug in scheduler

 - 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