Second release candidate for next stable release v4.2. - Run AP and FBW on separate boards - Separate Board Files for yapa_v2.0 - Add UART hardware flow control (for STM32 only) - Add ezosd current sensor module - Paparazzi Center: fix coloration by passing input buffer line by line, set language to english - Rate limiter bugfix - DC_SHOT message photo numbers shown in GCS - home mode height can be set different from security height - Ahrs float_dcm uses magnetic heading while not inflight for better initial guess - Outback Challenge "Safety" Rules 1 and 2 - Added WMM2010 Geo model used in ahrs int_cmpl_quat for rotorcrafts - Fix missing gain definitions from airframe file in total energy control - Added stm32loader to sw/tools - Change vsupply to be a uint16 to enable reporting of voltages higher than 25.5V - Digital cam module: release camera button on init - Fix second order term in propagation of x-position in HFF