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Revise recent changes to serial driver error handling:  Errors other than EINTR may be returned when the driver is used very early in initialization.  STM32 SPI driver will now survive repeated initializations

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drivers/serial/serial.c open, read, write, and poll methods will not return a short transfer or an EINTR error if a signal is received while waiting (only)

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Back out the last STM32 DMA priority change.  It is not necessary; just dropping the SD frequency was sufficient

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Update documentation to describe customization of NSH; Add the framework for a LPC43xx USB0 driver (not functional)

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