Added preliminary support for python 2.6

__init__.py

configfile.py

examples/__main__.py

examples/parametertree.py

flowchart/Flowchart.py

flowchart/Node.py

flowchart/library/__init__.py

graphicsItems/ArrowItem.py

graphicsItems/GradientEditorItem.py

graphicsItems/PlotItem/PlotItem.py

graphicsItems/ScatterPlotItem.py

graphicsItems/ViewBox/ViewBox.py

parametertree/Parameter.py

parametertree/ParameterItem.py

parametertree/ParameterTree.py

parametertree/parameterTypes.py

pgcollections.py

setup.py

widgets/DataTreeWidget.py

widgets/GradientWidget.py