Remove pro.user files from repository

pro.user files describe a user environment. They are not useful for
other people afaik.
Jelle's wijzigingen

De node class en een colour utility class
Renamed for consistency
Added new files to project
ui and naming corrections

The graphicsview ui element was displayed slightly outside the window.
This made the scroll bar look weird.
The window title was "MainWindow". I have changed it to IntelliGraph for
now.
Classes should have an uppercase name for consistency. Changed this for
Node.
Location fixes for workspace

It was not possible to add elements at given coordinates. This fix
should change that. Also some work towards the ability to add nodes to
the workspace.
Adding functionality to add nodes to workspace

From this point on you can add nodes by double clicking the workspace.
Node constructor fixed

The node constructor contained information that was not known when
creating the node. This has now been fixed.
Edge Class Added
Edge Removal
graphics changes to Node class
minor changes to Edge class
GUI added scaling layout
minor changes to workspace
Latest version with fixed width and height.
Bugfix problem with graphicsview/scene size

From this point on the scene should always be at least the size of the
graphicsview.
Added weights, selection and node creation.
Node class refactor

refactored the node class for the best compatibility
Merging changes in test to here

Trying to integrate this branch with the changes made in test
--pro.user

Removing .pro.user file again