[sys_time] fix get_sys_time_float function

fractional part was wrong
[logalizer] export lat/lon with 9 decimal places
[modules] fix gps_ubx_ucenter for ublox7

Thanks Alonso.
[hmc58xx] add a delay before configuring the HMC58XX mag
[adc][stm32] fix accumulation freq when using ADC_WATCHDOG
[stm32] spektrum: remove unneeded gpio_enable_clock

that is already done in gpio_setup_output
add GEO_MAG message to send magnetic field
[stm32] fix sys_time_usleep

only use systick counter
[omap] implement sys_time_usleep
[tests] add test_radio_control
[test] test_progs: only include baro_board for test_baro_board
Merge branch 'master' of https://github.com/paparazzi/paparazzi into delflyDesperado