New alias, exclusion functionality

Hi,

As discussed, here's the new code, with alias an exclusion functionality. Also removed the 'allxxx' mood commands, but have left in a way of triggering the special 'alloff' mood for now. Have also merged back in your changes, so hopefully should be easy for you to pull back in.

It's seen some testing and seems to be working ok, but let me know if you find any issues.

Julian