Allow background ops again
Adfs20.s: Earlier tidy up 3.44->3.45 had erroneously cleared the background transfer bit, so they were being rejected leading to various things hanging while they never completed. Adfs18.s: Safety NOP after mode change before banked register use for consistency with other mode changes in ADFS. Consts.s/ModHeader.s: Documented CMOS bits, use ADFSSWI_Base from Hdr:SWIs, assert local definition matches FileCore. Floppy *and* harddiscs tested this time. Version 3.47. Tagged as 'ADFS-3_47'
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