NSH USB Console:  Add logic to restart the console wait if an error occurs while reading from the console.  In USB console startup, the logic must be able to open the USB serial and receive 3 newlines.  However, it the USB driver is disconnected or otherwise fails before the 3 newlines are received, the receive loop becomes a killer, infinite loop, CPU hog.  Noted by spasbyspas

Network:  All logic will now handle varialbe length link layer protocol headers within incoming packets.  This permits use of multiple network interfaces with differing data links.  For example, ETHERNET + SLIP

Right now if you make a dns request before the dns address it set you will get an assertion. The state of the IP setting is not something the application should be aware of, it should only be concerned with whether or not the name was resolved.  From Brennan Ashton.

Rename all C files in apps/interpreters/bas to begin with bas_ in order to avoid future name collisions in libapps.a

Remove circular dependins in the Kconfig files.  Makes select of apps/examples/bastest a little more difficult

More global variable name changes for NuttX coding standards compatibility.  Make sure that g_bas_end is initially false

BAS: Fix another case were allocated pointer not being nullified and, hence, crashing the next time referenced after restarting BAS.  Also bring even more global varialbles and type names into NuttX coding standard

Need to nullify a pointer when BAS exits so that it is in the right state on restart.  Also bring a few global variables into the NuttX naming convention

BAS: Rename examples/bas to examples/bastest.  Hook into build and configuration system.  Finish ROMFS logic

BAS: Fix a GCC specific error.  Type of enums converted to int when passed to ... as variable argument