apps/nshlib:  Add the ping6 command to support checking IPv6 networks.  NSH logic is complete but still missing some network level support

Correct spelling:  MOUNTPOINT not MOUNTPOUNT.  Numerous places.  Some are problems.  From Woohan Lee

Netwoek:  Ada a parameter to netdev_register() to indicate the link protocol supported by the driver.  Use this value to replace some logic commited yesterday

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