Also delete some unused old junk variables. Add some comments. Start #defining SR flag constants. "implement" nx.
git-svn-id: https://dolphin-emu.googlecode.com/svn/trunk@2872 8ced0084-cf51-0410-be5f-012b33b47a6e
-Tagged unimplemented instructions and FIXME instructions in the DSP interpreter header
-Expanded the DSP instruction union to be viewable as helpful instruction structures
git-svn-id: https://dolphin-emu.googlecode.com/svn/trunk@2817 8ced0084-cf51-0410-be5f-012b33b47a6e