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

labcomm_encoder_ioctl_)

  put delimiter first in typeinfo to simplify parsing
  and not assume what delimiter should be used for
  various languages (was broken for C#)

compiler/CS_CodeGen.jrag:
  corrected handling of variable sized arrays (int -> packed32)

compiler/Python_CodeGen.jrag:
  added signature list 

C typeinfo now includes the cprefix. 

labcomm_encode_type_index, labcomm_encoder_end

Added test of generated C encoders.

encoder indices (linker magic provided). 

changed generated length to be without user_id field + started changing the sig_parser to build signature_t objects