- update upgrade issues:
+ ARM ABI change
+ new users
+ new groups
- add modules set where missing
- formatting improvements
- note that rtsol{,d} will be gone in the future
- fix raw partition

- update upgrade issues:
+ ARM ABI change
+ new users
+ new groups
- add modules set where missing
- formatting improvements
- note that rtsol{,d} will be gone in the future
- fix raw partition info
- update sparc64 hardware support
- remove note about sparc SMP support being broken
- update some size requirements (still lots of ancient bogus RAM
minimums lingering -- HI PORTMASTERS!)
- various other minor content modernization
- whitespace fixes

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Various updates to the INSTALL notes in preparation for 5.0. Changes
are still to come.

Copy the arm32 INSTALL notes, removing references to CATS, DNARD and RC7500
along the way.