For more extensive information on the packer and the options that it
can take, see the man pages and page 183 of John Ousterhout's book.
- anchor 
- Anchor type.  Denotes where the packer is to place each slave in its
parcel.
 
- expand
- Boolean, 0or1.
 
- fill
- Legal values: 'x','y','both','none'.
 
- ipadx and ipady
- A distance - designating internal padding on each side of the slave
widget.
 
- padx and pady
- A distance - designating external padding on each side of the slave
widget.
 
- side
- Legal values are: 'left','right','top','bottom'.
Release 2.4.4, documentation updated on 18 October 2006.
 
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