Support the Raspberry Pi model B+
Detail: There's some questionable code in DoSwi[Sector]DiscOp where it calls PollChange in an apparent attempt to support the ADFS floppy state machine. In the no-card-detect SDFS case, we can detect from a card's state whether it has been changed or not; to be able to signal this to software that cares about such things, we increment the sequence number late in the process. The downside is that when the card *has* changed, two consecutive PollChanged calls will differ from the steady state: the first because MaybeChanged is signalled, the second because the sequence number mismatches. DetermineDiscType didn't handle this gracefully, ending up pointing off the internal array of disc records, resulting in a string of gibberish when canonicalising a drive-based file spec. Fixed by having DetermineDiscType double-check that the drive is not empty. Fixed UpCall_MediaNotPresent and UpCall_MediaNotKnown to actually use the media type string from MiscOp 4. For example, you'll now see "Please insert card 'RISCOSpi'" being generated by the Wimp under SDFS. Improved documentation of MiscOps 4 and 5. Admin: Already in use in RC12a. Version 3.64. Tagged as 'FileCore-3_64'
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