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

Correct spelling:  MOUNTPOINT not MOUNTPOUNT.  Numerous places.  Some are problems.  From Woohan Lee