[rotorcraft] RC commands set when not in nav

Rotorcraft commands are set with a specific macro
[sim] call electrical_periodic in sim to get the current estimate
[gcs] [ground_segment] [speech] added speech_name feature so the audible alerts on the GCS can use an alternate name other than the aircraft name, defined as another field in the conf.xml aircraft entries, no entry falls back to using aircraft name. Note that still not complete, need to fix handling in paparazzi center as right now it deletes the field out of the xml file
[stm32] ppm: renamed USE_TIMx_IRQ to USE_PPM_TIMx and add a list with used TIMs
[subsystems/electrical] fix conversion of vsupply to decivolts
* Should now work correctly with <define name="VoltageOfAdc(adc)" value ="(VOLTAGE_ADC_A * adc + VOLTAGE_ADC_B )"/> with VOLTAGE_ADC_B in Volts
* Also fix VoltageOfAdc to DefaultVoltageOfAdc in board header for tiny_2.0
[subsystems/electrical] fix missing bracket
[stm32][adc] automatically use TIM1 for ADC if TIM2 is already used by RC ppm input on SERVO6
fixes #339
Baro MS5611 driver for I2C, SPI and auxI2C bus on Lisa M 2.0/Lia 1.1
* I2C - works with Aspirin 2.1, we have to define MPU6000_NO_SLAVES
* SPI - works with Aspirin 2.2
* generic - reading of barometers is done through Aspirin aux I2C (for Aspirin 2.1)

rotorcraft.makefile - here we choose which bus to use, if you have a better idea how to decide let me know

aspirin makefile - had to add a check for duplicities in ap.srcs and ap.CFLAGS, otherwise there was multiple definition of spi interfaces

main.c - default baro frequency is 100, which corresponds to roughly 20 baro updates per second, which is maximal possible value for
highest precision pressure calculation on MS5611
[stm32] fix renaming of USE_TIMx_IRQ to USE_PPM_TIMx
fixed typo
fixed typo
comment on why USE_AD_TIM1 is needed for PPM with input pin on servo6
[peripherals] some more defines for ITG3200 and info messages on aspirin configuration
[rotorcraft] motor arming with yaw: make the delay configurable via MOTOR_ARMING_DELAY
moved imu ppzuav and aspirin2_i2c subsystem makefiles to shared
[stm32][i2c] raise default I2C1_CLOCK_SPEED from 40kHz to 200kHz, print message with clock speed if defaults are used
[doc] minor updates for some modules
[dox] update Doxyfile for doxygen 1.8 and disable the stripping of doxygen comments in the source
update .gitignore
Merge branch 'master' of git://github.com/paparazzi/paparazzi