Fix some compilation errors when child status disabled; new waitpid logic not encoding/decoding status properly

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Yet another repair for the previouis botched recvfrom() fix; Fix telnet driver: It needs to break out of the read loop if 0 (meaning not conneced) of a value < 0 (an error) is encountered.

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

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Verified USB HID KBD driver encoding of special characters; apps/examples/hidkbd now decodes encoded keyboar characters.

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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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Add chip ID funcitions for Shenzhou and Cloudctrl boards; Extened NSH ifconfig command and improve DHCPC -- All from Darcy Gong

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configs/z8f64200100kit/ostest at same level as ez80 configurations; nuttx/arch/arm/src/lpc17xx/lpc17_i2c.cuninitialization fix

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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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