Updates to the SAHM package.  Add support for loading MAXENT parameters from a spreadsheet.  Add ClimatePredictorListWidget as a custom configuration dialog.
Updates to the SAHM package.  Add support for loading MAXENT
parameters from a spreadsheet.  Add ClimatePredictorListWidget as a
custom configuration dialog.

packages/sahm/init.py:
  - ModelBuilder.compute: FIXME to load and save parameters from MAXENT
  - PredictorList.get_widget_class: Config => Widget
  - ClimatePredictors: subclass of PredictorList
  - ClimatePredictors.get_widget_class: use ClimatePredictorListWidget
  - load_max_ent_params: new method
  - intialize: load MAXENT parameters from spreadsheet
  - _modules: add configure widget to ClimatePredictors

packages/sahm/sahm3.vt:
  - some minor updates

packages/sahm/widgets.py:
  - build_available_trees: new global method, cache trees
  - get_available_tree: new method
  - PredictorListWidget: base class for widget
  - PredictorListWidget.__init__: store tree_items
  - PredictorListWidget.set_values: new method
  - PredictorListWidget.get_values: new method
  - PredictorListConfigurationWidget: subclass from PredictorListWidget
  - PredictorListConfigurationWidget.setContents: call set_values
  - PredictorListConfigurationWidget.focusInEvent: new method, use get_values
  - PredictorListConfigurationWidget.focusOutEvent: new method
  - PredictorListConfiguration: new class
  - ClimatePredictorListConfig: subclass from PredictorListConfiguration
  - ClimatePredictorListWidget: new class

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