Add some protection to the priority inheritance logic when sem_post() is called from an interrupt handler

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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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Fix max filename size report by FAT statfs with long file names; Add missing logic to support fieldwidth and justification for %s format; Add extended help options.  Default help command just shows a short list of commands.  Verbose and single command help options

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Don't use strerror in apps/modbus; Add CONFIG_MB_TERMIOS to enable/suppress use of termios.h interfaces

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Use NuttX types in FreeModBus port; Add FreeModBus demo at apps/examples/modbus; Add new termios APIs

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NxWM: Finishes touchscreen implementation; NuttX: Standardize touchscreen initialization interfaces for all boards

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Add support for use of a USB serial device to provide NSH console I/O.  Verified on the Sure PIPIC32MX board

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Extend CDC/ACM driver so that can be connected/disconnected under software control; Add new NSH commands sercon and serdis that will connect and disconnect the CDC/ACM serial device

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readline() (and hence NSH) now accept the DEL character as well as the Backspace character for the backspace functionality

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