See documentation for details. In brief: - digital_protocol_* classes added (replace packet header blocks) - header_buffer class added - Lots of QA - default packet formatter: contains access code and payload length fields. - counter packet formatter: also contains the bits/sym in the payload modulation and a packet number counter. - Also adds QA code and the infrastructure for C++ QA code in gr-digital. - New block to use the packet formatter objects. - The header and payload are transmitted as PDU messages out of different ports. - header_buffer class for header formatting. - Used by packet_formatter_x classes to more easily add and format header data for transmission. - New blocks that parse headers. - Handles either hard or soft bits. Produces an info message to instruct payload demod. - 'receive mode' to header_buffer class. - Designed to make extracting fields from the received header bits easier for packet formatter classes. Use extract_field[N] to get the different fields out of a collected set of header bits. * Docs describing both functions with small examples for how to use them. - Don't force access code to be a multiple of 8 - need to verify everything else handles this correctly. - Throw an exception in the ctor if setting the code failed and emit a log message. Committed-By: Martin Braun <martin.braun@ettus.com>