* added update_legal_header.py script for updating the legal header in all code files of the project
 * ran the file => all TUMVis source files now contain the legal header

git-svn-id: https://camplinux.in.tum.de/svn/campvis/trunk@231 bb408c1c-ae56-11e1-83d9-df6b3e0c105e

* introducing transfer function editors: AbstractTransferFunctionEditor, SimpleTransferFunctionEditor and TransferFunctionEditorFactory
* added editor usage to TransferFunctionPropertyWidget

git-svn-id: https://camplinux.in.tum.de/svn/campvis/trunk@212 bb408c1c-ae56-11e1-83d9-df6b3e0c105e