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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Update NSH documentation; Add option to reduce size of help commnd without completely eliminating it

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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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Move RAMLOG driver to drivers/syslog; Add ability to output debug information to any character device or file

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Baud definitions (B9600 for example) are again encoded; Now supports the BOTHER settings which allows specifying the baud via c_ispeed and c_ospeed termios fields

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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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