Prefer is/is not None.
[mc] as: autopep8
[mc] Port stack-cleaner/as in Python This time we are Ruby-free.
Use env to find script interpreters Sometimes, there is no /usr/bin/perl.
[mc] Fix the stack-cleaner * '1 => tempfile' does not work on some versions of Ruby; * make sure the system() arg is not passed to the shell.
[mc] Add stack-cleaning compiler wrappers This compiler wrappers clear each satck frame before using it in order to avoid issues with unitialized variables in SimGridMC state comparison. Compiling with those compiler is much slower.