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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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Add board support at configs/zp214xpa for the The0.net ZP213X/4XPA board with the LPC2148; Add configurations sim/nxlines.  convert mcu123-lpc214x/nsh to use the kconfig-frontends.

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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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Add UG_2965SWEG01 driver from Darcy Gong; fix logic error in how waiters are reawakened in the USB HID keyboard driver

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Implement encoding the usbhost HID keyboard driver; configre olimex-lpc1766stk HID keyboard configuration to use the kconfig-frontends tool

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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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