TODO: In any orderBig list, but a lot of it can be done fairly easily with some old code.Note: most of these issues are quite old, and it's not clear who submitted themin this file and why and/or if some of them are fixed in the meantime. TheChangeLog might give some insight on this though.- DONE: Add frequency cutoff filter- DONE: Add ADTS headers- DONE: Write GUI- DONE: Add TNS- DONE: Add LTP- DONE: Add backward prediction (MPEG2-AAC)????- DONE: Test (and maybe fix) sample rates other than 44100 Hz- DONE: Test (and maybe fix) multichannel and mono support- DONE: Figure out how to read and write ".mp4" format- DONE: Write documentation for library interface- DONE: Improve command line tool- DONE: VBR quantizer- DONE: Speedup- Done: Clean up psychoacoustics code- Done: Add Window shape switching- Add PNS- Add IS- Add bit reservoir control- Add pulse coding (?)- Rewrite noiseless coding (now taken from old version) (?)- Better grouping support (?)- Fix short block psychoacoustics (?)- Fix TNS (hans-juergen, Oct 17, 2004)- Fix LTP (hans-juergen, Oct 17, 2004)- Fix Main (hans-juergen, Oct 17, 2004)- Add resampler and downmixer (hans-juergen, Oct 17, 2004)- Add HE AAC (hans-juergen, Oct 17, 2004)- Fix mysterious crash/freeze with some decoded WAV files on  Linux: endianness? TNS? M/S? decoder bug? (hans-juergen, Oct 17, 2004)- Fix default ABR cutoff frequencies at different bitrates  (hans-juergen, Oct 17, 2004)