Improved Composite parameters

[teubert]

Requirement Text
Allow the setting of composed model parameters in a CompositeModel

Background Information
Right now the composite model expects that you set the parameters either before creation or by accessing m.parameters['models'].parameters. This is 1. messy and 2. doesn't work with prog_server.

Suggested Solution
Parse parameters using 'model_name.parameter' so m.parameters['abc.def'] would set m.parameters['model'].parameters['def'].

DoD

• Implement feature
• Add to example
• Add tests
• update documentation
• Add to change notes for next release