Update of vhdl samples files
Samples cleaning
Update of makefile
Update of test cases with new version of Linty VHDL parser
Added makefile to launch tests
Correct version of the two_counters exported json file
Added two_counters example
Counters, programmable pulse, d-latch VHDL examples
Update of d-latch sample
Added test laucher for lustre generation
Continue even if generation fails
Makefile update for new version of lustrei with command line parameters
Test file update for typo
Added example from some courses
Updated tests for lustrei vhdl import
Added tests for vhdl import and export (pp)