refactored grammar: added TypeInstance :: DataType Name  and renamed Program to Specification (based on cherry-picked (parts of) 9d2ca1)

used in the program.

unused typedefs.

Removed compiler noise from 2014

C and python passes some tests...

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.

labcomm_internal_encode, this triggered lots of changes to handling of 
stacked writer allocation. Twoway example is not finished yet.

Added dynamic macros and code for dynamic arrays indexed by signature
index.

labcomm_encoder/labcomm_decoder into labcomm.c