sometimes I want to compile and not save files nor be asked

[Dan Jacobson <jidanni@jidanni.org>]

Compile's docstring should mention compilation-ask-about-save.

Documentation:
*Non-nil means C-x c asks which buffers to save before compiling.
Otherwise, it saves all modified buffers without asking.

Well gosh, how about what if we just plain don't want to be asked
about saving, and don't want gratuitous saving?

I suppose that 3rd possibility will not fit into the nil/non-nil
paradigm mapped out above, that leaves no room for adding more
possibilities later.