Extend current XGobi file set

Root file name
  Specify fname, the base name for the new file set.  This
  is likely to be the same as the base name for the current data,
  but it doesn't have to be.

  If saving S files, don't specify the path.  Otherwise, do.

Save .bin file
  Save the data in binary format.  This is useful for very large
  data files, because it speeds up initialization quite noticeably.

Save .colors file
 'fname.colors' contains strings representing the color names.
 The names used will be the same as those appearing on the Color Menu. 

 If you started XGobi from inside S, a character vector of color
 names is created.

Save .glyphs file
 'fname.glyphs' contains integers (one per row) representing the
 glyphs used -- the same numbers that can be found at the right of
 the glyph menu.  (Plusses are 1-5, Xes are 6-10, open rectangles
 are 11-15, filled rectangles are 16-20, open circles are 21-25,
 filled circles are 26-30, and the point is 31.);

 If you started XGobi from inside S, an integer vector is created.

Save .erase file
 'fname.erase' contains 1s and 0s, where 1s are erased points.

 If you started XGobi from inside S, an integer vector is created.

Save .lines file

  The file you create consists of pairs of numbers on separate lines,
  where the pair indicates the row numbers of the points to be connected,
  for example:

  1 3
  1 4
  2 5


 If you're in S, then you can turn the S vector you save into a
 .lines array like this:
   t(matrix(fname.lines, nrow=2))

Save .linecolors file
  Generate a file like the .colors file described above, where
  the first color corresponds to the first line defined, and so on.

 If you started XGobi from inside S, a character vector of color
 names is created.

Save .resources file
  Store a few critical layout features for this data (the width and
  height of the plotting window, the width of the variable selection
  panel) and several logical variables set using the options menu
  (showAxes, showPoints, etcetera).  Store that information in a file
  named fname.resources (where fname is the name of the current data)
  and it will be retrieved when you next start XGobi using this same
  data.

  That file can be directly edited as well, to change other
  resources on a data-specific basis, for example:

  *XGobi.title:    XGobi: Hourly Residential Telephone Usage
  *XGobi.iconName: XGobi: Usage Data
  *plotFont: -*-lucida-medium-r-normal-sans-20-*-*-*-*-*-*-*
  *glyphType: 2
  *glyphSize: 3
  *brushColor0: white
  *brushColor1: red
  *brushColor2: green
  *VarLabel.width:  30
  *VarWindow.width: 30