USBtinyISP

Yesterday I got my USBtinyISP from HobbyKing, but had no time to test it yet. I already wrote the code for the AVR so I can't wait to try that. I still need to work on the midi reception in the Raspi, to change rtMidi to use serial midi (at a non standard baud rate) instead of ALSA midi. One possibility is to use ttymidi (which converts serial to ALSA midi messages), but my plan is to extend rtMidi instead and not use ALSA midi at all.