First cut of c2wideband.c and its wideband_enc_dec() function.

First cut of c2wideband.c and its wideband_enc_dec() function.
A unittest/tc2wideband.c file has been created to test some of the core calculation functions, plus to run wideband_enc_dec() with random data in order to track down buffer overflows, etc.
At this commit, the unit tests in this new file run. The core functions operate as expected. wideband_enc_dec() runs on a single block of 16 frames without crashing, and has been stepped through to validate that most code is working as expected. Real data has not been used at this point in time.
Created generate_wideband_map.c, which creates c2wideband_map.h from the Octave text file ../Octave/c2wideband_map
codec2.c, c2dec.c, c2enc.c have been adapted to include the new wideband option.
Makefiles have been adapted and appear to work.

git-svn-id: https://svn.code.sf.net/p/freetel/code@3314 01035d8c-6547-0410-b346-abe4f91aad63