Some useful operational extensions to newfs_msdos, especially

when preparing images for emulators or flash devices:

+ option '-C size' to create the underlying image file with given size.
  Saves doing a 'dd' before, and especially it creates a sparse file

+ option '-@ offset' to build the FAT image at the specified offset
  in the image file or device;

+ make the cluster size adaptive on the filesystem size.
  Previously the default was 4k which is really unconvenient with
  large media; now it goes from 512 bytes to 32k depending on
  filesystem size (i still need to check whether it makes sense
  to go further up, to 64k or above);

+ fix default geometry when not specified on the command line,
  use 63 sectors/255 heads by default.
  Also trim the size so it exactly a multiple of a track, to avoid
  complaints in some filesystem code.

+ document all the above, plus some manual page clarifications.

MFC after:	4 weeks

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