Fix error in new macro definition that causes compile problem when not using a kernel-mode build
Mostly cosmetic changes
Fix 'make export'.  Adding subdirectories to the sched/ directory broke the header file collection logic
In the kernel build, only the user libraries should be exported.
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In 'make export', do not copy internal header files if this is a kernel build
Don't copy build scripts for kernel build 'make exports'
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The 'make export' target needs to bundle up the user C startup file (crt0), not the kernel head object
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Beginning of logic that will, hopefully, all me to build applications against a NuttX export package (vs. the nuttx/ source tree).
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Add .gitignore file
Add tmp/ directory to .gitignore
Add the .config file to the export package
Add a 'make import' target
Add the .config file to the export package
Add an apps/import Make.defs file.  Not much there yet, but it will be needed for 'make import'
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Remove the 16z board support from the main source tree.  It is still avaialable in the misc/Obsoleted directory