THTTPD: Add support for using binfs/ instead of NXFLAT.  NXFLAT is probably the better solution but recently compiler changes make it unusable.  binfs or ELF are fallback binary formats.  This commit adds an option to use binfs.

STM32 F4 Discovery: Move up_cxxinitialize from nuttx/configs/stm32f4discovery/src to apps/platform/stm32f4discovery where it belongs.

apps/examples/elf: Add configuration optionst o support building the hello++4 example that depends upon having uClibc++ available.  From Leo aloe3132.

Enhancements to NSH ifconfig for case of multi-link operation, TUN device and local connections.  From Max Neklyudov.

Add a test of nested signals.  There are no failures to handle signals but neither am I getting any nested signal handling

STM32F429i Disco: (1) Fix a bad return value if the LCD driver is already initialized. (2) The LCD driver initialization is now performed during the early boot sequence.  (3) Increased the size of the message queue from 32 to 64 in the lcd configuration.  From Marco, ocram.lhark@yahoo.com.

apps/examples/nxlines:  Fix missing right bracket that causes compile error when CONFIG_NX_XYINPUT=y.  From Librae.