New data

In this mode, you can read in a new data file together with its
associated labels.  This is done by means of a popup window which asks
you to type in the name of the file to read.  (This has not been
implemented from within S.)

If you type in the string 'fname,' then the data file can be named
either 'fname' or 'fname.dat.'  Other files are named as follows:

fname.col:  column labels, one per row
fname.row:  row labels, one per row
fname.vgroups:  variable groupings, all in a row
fname.glyphs:  a glyph id for each point, one per row
fname.colors:  a color name for each point, one per row
fname.erase:   a single long column, with a 1 or a 0 indicating
 which points should be erased
fname.resources:  a few resource lines, specifying the size of the
 plot window and the variable selection panel for this data;
 can be created by the 'Store resources' command


