P-code BINFMT:  Add logic to pass information from the binfmt logic to the P-code interpreter.  This includes some extension to the binfmt interfaces.

Add serial method so that lower half driver can provide RX flow control information.  From Jussi Kivilinna

The alternate console device CONFIG_NSH_CONDEV must not be defined unconditionally.  This causes errors when using Telnet sessions.  This was solved by adding CONFIG_NSH_ALTCONDEV: CONFIG_NSH_ALTCONDEV enables or disables the feature then, if enabled, CONFIG_NSH_CONDEV provides the alternative console device name

apps/netutils/ntpclient:  Add a primitive NTP client.  Initial checkin is untested and probably incomplete

Fix a build error when only USB device tracing is enabled (from David Sidrane).  Also an update to the USB tracing document

SAM4E: Fix EMAC pin configuration.  Driver is basically functionaly now.  SAM4E-EK NSH configuration now has networking enabled by default

Support for the older, manual configurations has been completely removed from the NuttX build system

unlink/rm can now be used on nodes in the pseudo-filesystem.  There is new configuration option to suppress these costly and mostly useless operations on the pseudo-filesystem