Update test
Update the tests
Upate _oasis
Update autogen files
More improvements

* add a clean command
* generate a valid Makefile
* start the jobs after evaluating their arguments
* expose V1 which specialize signature from mirage-types/V1 using Lwt.t instead of an abstract io
Fix the propagation of errors in the generated code

Would be nice to expose the usual combinators of the error monad at some point
Initialise the console in the genrated code if needed