added option, --adapt-thres-type 2 (auto-level adjustment of the ATH
added --adapt-thres-type 2 (auto-level adjustment of the ATH,
added set/get functions to include/lame.h for option --adapt-thres-type
added set/get functions to libmp3lame/set_get.c for option
added an --adapt-thres-level option to allow adding an offset (in dB)
Fixed trailing data bug introduced with the 24 bit input code
Add 24-bit PCM waveform input capability (with or without libsndfile),
Added "--athtype 5" to better represent higher frequencies (14 - 19 kHz).