This change introduces a modified version of gprsdecode utility,
which is intended to decode the GPRS burst captures and forward
decoded packets to the GSMTAP sink.
The following modifications were made:
- use shared libosmocoding library for GSM 05.03 coding;
- use optget for command line options parsing;
- use a single application select loop;
- use GNU automake as the build system;
- add regression tests (GNU autotest);
- clean up and comment the code;
- add license headers;
The code is based on work of SRLabs:
https://srlabs.de/
git://git.srlabs.de/gprsdecode.git
Related: OS#1672
Change-Id: I12234d37c66b83b8abd60f7511fa1d7837db1856