mubu:
- fixed errors in todict function
- fixed addbufferpaste function
- fixed crash in writetrack to .wav files
- added pastereplace function

imubu:
- new replaceaudibuffer and pasteaudiobuffer functions
- scatterplot: fixed display of rotated ellypses with zoom
- fixed Sonogram/multiwave/traces display for ring track

mubu.record
- added overdub mix mode

Several other minor bug fixes