Replace simpletest.c with simpletest.cpp
Add test wav file
Fix bug in ringbuf
Use AM_CPPFLAGS instead of AM_CFLAGS
Add normalisation capability to xtract_lnorm()
Update documentation for xtract_lnorm()
Fix bug in xtract_peak()
Fix bug in xtract_last_n()
Fix broken xtract_stateful.h