Process priority setting

[Philippe Michel]

Gnubg's CLI has a "set priority" function that allows to run it with a 
lower priority, or, theorically, a higher one, but the latter never 
worked on Unix and hasn't in Windows for some time (it may have in the 
past but now you would need no run it with elevated privileges to do 
this, a dubious idea).

Recently Issac tried to add something in the GUI to set this priority 
more easily, but this doesn't works well since the lower setting is 
autosaved and you cannot raise it back to the default without editing 
the gnubgautorc file...

The whole idea may have been useful 20 years ago when consumer grade 
CPUs had only one core, but I'm inclined to think that now one would 
share the computer resources between an interactive gnubg instance (or 
other software) and a rollout by running them with a number of threads 
lower that the number of CPU cores. For instance using 2 threads by 
default on a 4 cores CPU.

Would anyone mind if the feature was entirely removed? If you use it, 
could you explain in what circumstances? And how effective it really is?