Add multithreaded support for testing.

	* build-all.sh: Delete trailing spaces
	* define-release.sh: Created.
	* dejagnu/baseboards/atmel-studio.exp: Delete trailing spaces, get
	port dynamically.
	* get-ip.sh: Created.
	* run-tests.sh: Use getopt for options.  Add options for setting
	up gdbserver.  Optionally set up and close down multiple GDB servers.