I just installed arduino IDE 1.6.0. I typically don't try new things. But I did it because users of my latest devices will likely download the latest thing to try out. What I was able to do in 1.0.5 with Mighty1284P processor mod to the IDE is no longer seen on the new IDE after I pointed the arduino sketchbook folder to the correct location. I dug into the new IDE's folder. What used to be hardware/Arduino/ in IDE 1.0.x is now split between hardware/arduino/avr and sam folders, same as 1.5.x that I've never used. I wish they made a guide to modding IDE that I can follow. So other than the obvious, creating these folders in arduino sketchbook folder under hardware/arduino, what else should I do?