Useless TIOCSERGSTRUCT logic in most serial drivers is not compiled unless CONFIG_DEBUG and CONFIG_SERIAL_TIOCSERGSTRUCT are defined

Reviewed all task exit logic.  For pthread_exit() moved some logic higher in the exit sequence that could be required to block.  For lower level logic kicked off by _exit(), add logic to prevent blocking when the task is not in a healthy state.

Documentation now expects autogenerated configuration variable documenation at Documentation/NuttXConfigVariables.html

Add a tool to auto-generated documentation of NuttX configuration variables (still a work in progress)

Fix major misthink in Cortex-M0 port:  The Cortex-M0 has no BASEPRI register.  We have to revert to using the nasty PRIMASK register

Convert olimex-lpc17stk configuration to use the kconfig-frontends tools; Fix some compile errors in the pl2303 USB device driver

Fixes to the LM4F clock configuration.  Errors in register handling caused everything to run at half speed

LPC17xx GPIO interrupt fixes: lpc17_setintedge() must be atomic.  Can't disable interrupts from interrupt handlers because they are automatically re-enabled.  Try re-configuring pin instead.

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More naming changes associated with earlier renaming of LP17xx up_spiinitialize; LPC178x SSP support; Open1788 SSP and touchscreen support

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LPC17xx SPI and SSP initialization functions both called up_spiinitialize();  Changed to lpc17_spinitialize() and lpc17_sspinitialize().

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