Copter: increase Rate PID param ranges

RATE_RLL_P to 0.25 (was 0.20)
RATE_PIT_P to 0.25 (was 0.20)
RATE_YAW_P to 0.50 (was 0.25)
RATE_YAW_I to 0.05 (was 0.02)
Frame_params: Updated 3DR_Iris+
CHDK-Scripts: Creating folder for Cannon SX260 files
CHDK-Scripts : initial commit of the SX260 specific file
CHDK-Scripts: Move SX260 file to its own folder
Frame_params: Added Frsky telemetry to 3DR_Iris+.param