[patch 3/4] Nios II gdbserver support, version 2

[Sandra Loosemore]

Here is a revised version of the gdbserver parts of the Nios II port. 
I've tweaked the copyright dates, comments, and formatting similarly to 
what I did to the GDB-side patches.  I also made a few cleanups to the 
register-handling code to be consistent with the technical changes I 
made on the GDB side.

OK to commit?

-Sandra

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