apps/examples/pdcurses:  Add a very simple example that just shows the entire character set (7-bit only).  It adapts to the size of the framebuffer and, hence, can be used with very tiny displays.  In fact it looks really dumb on big displays.

apps/example/fb:  Restores 0205eeef.  It was correct all along.  Also fixes calculation of the end byte position.

apps/graphics/pdcurs34: When clearing screen, width calculation should round up for any fractional bytes.  When pdcurses is closed, forgot to close the djoystick driver.

This reverts commit 0205eeef.

apps/graphics/pdcurs34:  Correct logic that clears the screen.  For the casee of BPP < 8, it was writing beyond the end of the framebuffer and clobbering things.

i8sak: Adds ability to get/set rxonidle setting for MAC layer

Approved-by: Gregory Nutt <gnutt@nuttx.org>

i8shark: Adds CONFIG_IEEE802154_I8SHARK_XBEE_APPHDR option to remove XBee's application header before sending to Wireshark. This option will corrupt any traffic received that does not include this application header.

Approved-by: Gregory Nutt <gnutt@nuttx.org>

apps/graphics/pdcurs34:  Monochrome/greylevel framebuffer support is now code complete, but untested.  Also added support for Y2 and Y2 color formats.

apps/graphics/pdcurses:  Add support for discrete joystick input.  This is sufficient to get through all menuing tests that do not require text input.

apps/pdcurses/: Fix a few more bugs found in testing; apps/examples/pdcurses:  Brings in the remaining pdcurses demo programs.

    apps/graphics/pdcur34:  Various fixes from initial testing.  Still does not work

    apps/graphics/pdcurs34/nuttx:  Completes first cut at framebuffer rendering logic.

apps/graphics/pdcurs34:  Add NuttX framebuffer color managment and beginning of some rendering logic.

apps/examples/pdcurses:  Bring pdcurses demos and make them conform to the NuttX coding style (not yet hooked into the build system).