Flight/Battery Module-Fix "else" code style
Flight/ADC-FlyingF3 enable ADC driver
Flight/ADC-Rename PIOS_ADC_DMC_irq_handler to PIOS_ADC_DMA_irq_handler
Flight/Internal ADC-do not typedef adc_pin

Only afects the F3 driver since this struct is not used by other targets
at the moment.
Flight/ADC-revomini board_aw_defs declare the DMA handler as static.
Flight/Battery Module-Deleted shouty comment.
Flight/PCF8591Driver-Removed PIOS_PCF8591_NUMBER_OF_ADC_CHANNELS from array init.

Also used NELEMENTS(ADC_CHANNEL) where needed instead of
PIOS_PCF8591_NUMBER_OF_ADC_CHANNELS
Flight/PCF8591Drv-Use sizeof for i2c buffers instead of hardcoded size.
Flight/PCF8591Drv-Fixed typo (adress->address)
Flight/ADC-Fixed identation in pios_internal_adc_priv.h file
Flight/PCF8591Drv-Increased PIOS_PCF8591_ADC_Available readability.
Flight/CC-Fixed typo adress->address
Flight/TopLevel ADC-Use number_of_channels to compute offset

even if there is no get_pin function.
Flight/pios_adc.c Fixed style
Flight/DMA_HOOKS- Fixed filename on header
Flight/DMA-Don't typedef "void *"
Flight/FlyingF3 pios_board.c don't initialize global variables to zero

They must be guaranteed to be zero'd during init according to the C
standard