Updated the licence info and header for each file.Moved backends in separate folders
Moved c_backend in separate folder
clean handling of undefined node application
answer to #feature 50: - arrows are now factorized out and become part of include as files arrow.h and arrow.c - no more arrows in generated code - compiling and linking arrow.c is only necessary in case of dynamic allocation - version now includes installation prefix (for the standard lib)...
Moved files to trunk in lustre_compiler