grep mode deserves its own variables and hooks

[Dan Jacobson]

Regarding the variable compilation-scroll-output,
Documentation:
*Non-nil to scroll the *compilation* buffer window as output appears.

Setting it causes the compilation-mode commands to put point at the
end of their output window so that the end of the output is always
visible rather than the beginning.
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Yeah, but is it elegant to drag grep-mode's behaviour along with it?

No excuses, the mode line says "grep", not "Compilation", so it
deserves its own variables, hooks, etc.  I'm sure you can figure out a
historical compatibility method to not perturb habituated users with
customizations in pace, some thing like 'run grep hook, if it is nil,
then run compilation hook; grep hook = t avoids running compilation
hook...
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