Save Configuration

This menu option allows a user to save the current data analysis graph's
configuration to a directory for future retrieval. This includes the
layout of a data analysis graph as well as the configuration information
of each module within that graph.  This allows a data analysis graph to
be built just once, but used many times on different data sets.

When this option is selected, a file selection dialog appears, with the
default configuration directory path as its starting point.  The user
may traverse the directory tree until the desired location to save the
configuration is found, then the configuration's name may be entered in
the file selection dialog's text entry window.  Pressing OK will cause
the configuration to be saved as a directory with the configuration's
name, under the current directory.  Any existing configuration with the
same name will be overwritten.

