[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. 

continuation bit. C# is currently (intentionally) broken. 
Java and Python are untested.

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