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

Start of adding GPLv3 licensensing.

Labcomm cleanup (still more to do)

Changed reader/writer interface to simplify stacking (example will 
be forthcoming).

fd_reader/writer more robust: no dependency on 'int *fd' to be live
while the reader/writer is in use).

labcomm_encoder_ioctl_)

encoder indices (linker magic provided). 

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