stdint.h:  Don't use hex values to specify minimum values of fixed width, signed values.  Hex values are inherently unsigned and not usable for this purpose in all contexts

avsprintf():  Fix a bug in usage of va_list on x86.  On x86, va_list is a pointer to a single copy on the stack.  avsprintf() calls lib_vsprintf() twice and so traverses the va_list twice using va_start.  va_start modifies that single copy on the stack so that the second call to lib_vsprintf() fails.  This appears to be an issue with x86 only so far

Set the GPIO_SPEED_50MHz on all F2 and F4 SPI pin configurations.  This is based on an F411 SPI1 errata but the fixed is generalized to all SPI and all F2 and F4 (let me know if this introduces any other issues).  Discovered and fixed by Sebastien Lorquet after much consternation.

Add sys/custom_file.h.  Used when CUSTOM_FILE_IO is define and avoids re-definition errors about the FILE define.  From Thomas Gruber via the PX4 repository

In message queue created return ENOSPC error if size exceeds the configured size of pre-allocatd messages; Use ENOSPC vs ENOMEM per OpenGroup.org.  From  Pierre-Noel Bouteville

msg type should be char * not void * in mq_send, mq_timedsend, mq_receive, and mq_timedreceive.  Noted by  Pierre-Noel Bouteville

Nucleo-f402re: Add an option to use only a minimal set of joystick buttons.  This eliminates some GPIO conflicts

Nucleo-F4x1RE: Add support for an analog joystick shield.  There are still some ADC issues to be worked through as of the initial commit