This is a complete refit of the mac68k documentation.

Of particular note is documentation on the new preferred method of
installation using sysinst, provided (and updated) by Bob Nestor.

clean up whitespace and formatting

more work:
- use .Tn, .Bx, .Ul, .Key, .Sq, .Dq, .Li, .Dl, (etc) ... as appropriate
- be more consistent between various ports' install notes
- other cleanups

major terraform (this is MUCH more than a rototill :-), including:
- update for 1.5 (still more MD stuff to check)
- use new macros in ../common/macros as appropriate
- introduce some CONSISTENCY bet

major terraform (this is MUCH more than a rototill :-), including:
- update for 1.5 (still more MD stuff to check)
- use new macros in ../common/macros as appropriate
- introduce some CONSISTENCY between the various ports' install docs
- use various mdoc macros as appropriate, including .Li, .Pa, .Sy, and .Ic.
- migrate more stuff into ../common/*
- whitespace cleanup
- lots of other little things i'm sure...

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Bring back credits that were in the old version of mac68k/legal.