hidden sector count fixes for fat12_16_dbr, fat32_dbr, exfat_dbr and ntfs_dbr#219

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pts wants to merge 6 commits intochenall:0.4.6afrom

Commits on Nov 11, 2019

applied the hidden sector count fix to fat32_dbr
Peter Szabo
committed
applied the hidden sector count fix to fat12_16_dbr
Peter Szabo
committed
applied the hidden sector count fix to exfat_dbr
Peter Szabo
committed
applied the hidden sector count fix to ntfs_dbr
Peter Szabo
committed
prefactor: optimized ntfs_dbr for size and moved some code to the 2nd sector, making room in the 1st sector for the next change
Peter Szabo
committed
made ntfsg.S work with sectors_per_track=0 and number_of_heads=0, the defaults of mkfs.ntfs (unfortunately GRLDR still doesn't work with these)
Peter Szabo
committed