apps/examples/helloxx entry point name was mangled when built as an NSH builtin; plus some README updates

Rearchitecting of some MTD, partition, SMART interfaces, and FLASH drivers to:  Better use the byte write capbility when available and to use smaller erase sectors for the erase sector size when available).

Add support for the byte write method to MTD partition logic;  Beef up the MTD partition test -- and fix resulting bugs detected

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Add support for a login script (in addition to the init script); Add logic so that a USB console session can connect and reconnect to the USB serial device

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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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