C and python passes some tests...

python code for the test harness.

pruned and grafted the refactored compiler from the metadata branch. Tests run, but code needs cleanup

Exposed constructor for generated code in case automatic calling not
supported on platform.

linker section tricks. Fallback is to manually call the init function of
each labcomm module.

[GNU] ld tricks (instead we rely on cpp tricks and some heuristics
for memory allocation) so we probably should rewrite labcomm compiler
to generate cleaner code for this use-case.