Major overhaul of sunlabel(8).

. Implement option -c, all partition sizes will be calculated
  in cylinders as opposed to sectors.  Since the Sun label is
  inherently cylinder-based, this makes the job a little easier.

. Implement option -h, print the label in `human readable'
  size/offset format.

. Implement SVR4-compatible VTOC-style elements.  They are
  fully optional, defaulting to the current behaviour where no
  VTOC-style table will be written to disk.  However, if
  desired, the full functionality of the partitioning menu of
  Solaris' format(1m) is now offered (and even more).

. When editing the label, do not loop around edit_label() where
  a new template file is generated for each turn, this used to
  be annoying in that any possible syntax error caused a
  complaint, but then the template was created anew, so the
  user had to perform all their editing again.  Rather loop
  inside edit_label(), similar to bsdlabel(8), so in case of
  errors, the user will be presented their previous template
  file again.

. If VTOC-style elements are present, the overlap checks are
  made less stringent.  Overlaps will still be warned about,
  but overlaps of `unmountable' partitions against other ones
  are no longer fatal.  That way, e. g. VxVM encapsulated
  disk labels can be fully edited in FreeBSD (but not in
  Solaris ;-).

. In print_label(), generate the editing hints only if the -e
  flag is in effect.  Additionally, print a hint about the
  total number of sectors in the (hardware) medium.

. When editing a label, allow for changing the geometry
  emulation (and textual name) by modifying the "text:" line
  on top.  That way, a more effective emulation can be
  chosen.

. When editing/reading a label, additionally allow for the
  suffixes `s' (512-byte sectors), and `c' (cylinders) in the
  partition size field.

. Finally, turn the stub man page into something that really
  explains the entire thing.

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