This change should significantly improve the performance of single precision floating point math library functions. The vast majority of changes have to do with preventing the compiler from needlessly promoting floats to doubles, performing the calculation with doubles, only to demote the result to float. These changes only affect the math lib functions that return float.

VFS ioctl() again.  Per comments from David Sidrane, file_ioctl() should not return success if the ioctl method is not supported.  It probably should return ENOTTY in that case.

stm32l4_tickless; avoid Lyme, support timers, pwm, oneshot, freerun, and tickless scheduling

Feature/stm32f4discovery can

stm32_serial.c edited online with Bitbucket

Upstream_nucleo 144

stm32_serial.c edited online with Bitbucket

Stm32l4 USB support

update usb dev/host controller drivers to reflect new(ish) logging standards; augment device enpoint and fifo allocation #defines to do more sanity checking, and be automatically adaptive to size changes.  Update README.txt to reflect current status of the implementation.

Conflicts:
	configs/stm32l476vg-disco/nsh/defconfig