Load Configuration

This menu option allows a user to load a previously saved Pablo
configuration.  This includes the layout of a data analysis graph as
well as the configuration information of each module within that graph.

When this option is selected, a file selection dialog appears, with the
default configuration directory path as its starting point.  Pablo
configurations are stored in directories, and any previously stored
configuration may be loaded by traversing the directory tree with the
file selection dialog, and selecting the desired directory name.  Double
clicking on the selected directory or pressing the OK button of the
dialog will cause the selected configuration to be loaded into Pablo.
Note that a configuration can only be loaded if Pablo does not already
have a data analysis graph built.  

Once the configuration is loaded, it may be edited, reconfigured, or run
immediately. 
