Add an install target to all makefiles.  For the import build, the top-level Makefile now does two passes: (1) builds libapp.a, then (2) installs the programs (not yet finished)

Beginning of logic that will, hopefully, all me to build applications against a NuttX export package (vs. the nuttx/ source tree).

apps/Makefile should include external/Make.defs so that external applications can participate in the menu configuration

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Remove some dependencies of distclean on clean.  This should not be necessary in higher level makefiles and should speed up make distclean

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Simple window natives OS test build now works; Probabaly more to do for other configs; clean targets still have problems

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Change order of includes in apps/Makefile; add clock frequencies to shenzhou, fire, and olimex-stm32 board.h files

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Make NX and NXTEXT built-ins; extend stm3210e-eval/nsh2 config to run the NX example from the NX command line

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