* New <subCircuitsPathes> section in <circuit> that lists the pathes that contain subCircuits xml files
* New Device object that inherits from simplified Instance object.
- Instance has a name, a model, some connectors and optionnal parameters
- Device has the same attributes plus mosType, sourceBulkConnected and transistors
* Updated readFromFile and wrtieToFile methods to support these modifications
* Updated parse and drive examples to support these modifications
- Note: only C++ examples has been updated since my boost.python environment is actually totaly broken
* New buffer.xml example that uses subCircuits.