Save Layout

This option allows a user to save the current data analysis graph's 
layout.  The layout consists only of node connections and positions
within the graph, and has no module specific configuration information
in it.  Layouts are useful if the same fundamental graph will be used
over and over, but the configuration is likely to vary from use to use.

When this option is selected, a file selection dialog will appear, with
the default layout directory as it's starting place.  Layouts are stored
in files, so the directory tree is traversed until the desired directory
for the current layout's layout file is reached.  The name of the layout
is then entered in the file selection dialog's text window.  Pressing the
OK button will cause the current graph's layout to be saved in a file with
the layout's name.  Any previously saved layout of the same name will be
overwritten. 


