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.