NSH will now run files from the file system; Add logic to unload and clean-up after running a task from a file system; Extensions to builtin apps from Mike Smith

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Change the way thread priority is handled in binfmt/ to better match the way that priority is set up for the builtin tasks

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Rename apps/include/apps.h to builtin.h.  Move parts of apps/builtins/exec_builtin.c to binfmt/libbuiltin/libbuiltin_utils.c

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Finish dup logic for open files; fix bug in sigtimedwait(), would return wrong signo value if the signal was already pending

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Add support for dup2'ing files.  Infrastructure and ROMFS done.  Still need FAT, BINFS, NXFFS, and NFS

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Add interfaces to dynamically change symbol tables used by posix_spawn, execv, and execl.  This is needed for testing.

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Removed posix_spawn signal masks - they cannot be supported in NuttX; Add skeleton for posix_spawn proposer - still incomplete

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Change naming of all Stellaris pre-processor symbols from LM3S_ to LM_ to make room in the namespace for LM4F

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Rename LM3S files, variables, and types from lm3s_ to lm_; Rename configuration variables from CONFIG_LM3S_ to CONFIG_LM_

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