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Previously, when an MDI window was being dragged very fast and its state
changed from docked to floating (or vice versa), it wouldn't be placed
under the cursor, but instead some way behind it (with regards to the
drag direction). This happened because we decided where to place the
window's based on its last position in its previous state. Now we use
the cursor's position to calculate the window's new position, which
fixes the problem.

To better group MDI-related classes, all of them have been moved to the
´gui/mdi´ directory.

VisualizationPipelineWidget has been renamed MdiFloatingWindow, and
refactored to make it easier to use it with arbitrary widgets.

VisualizationPipelineWrapper has been renamed MdiDockArea, and refactored
to make it easier to use it with arbitrary widgets. It now inherits from
QMdiArea, which removes an unnecessary layer of indirection. Moreover, it
creates MDI subwindows and floating windows only if necessary, i.e. when
a widget stored in it changes state.

VisualizationPipelineWidget and PipelineMdiSubwindow have been extended
to report changes in their positions to VisualizationPipelineWrapper.
Based on the information the latter receives, it decides when to undock
MDI subwindows and dock floating pipeline widgets.

As a result, it's now possible to drag visualization pipeline widgets
back into the MDI area and turn them into MDI subwindows.

The way visualization pipelines are displayed has been considerably
reworked. A new class, VisualizationPipelineWrapper, is now responsible
for creating all necessary representations (VisualizationPipelineWidget,
PipelineMdiSubwindow) of a visualization pipeline and seamlessly
switching between them in response to the user's actions (window
dragging, key presses, etc). As a result, it's now possible to drag
visualization pipeline widgets out of the MDI area and turn them into
top-level floating windows.

git-svn-id: https://camplinux.in.tum.de/svn/campvis/trunk@338 bb408c1c-ae56-11e1-83d9-df6b3e0c105e

git-svn-id: https://camplinux.in.tum.de/svn/campvis/trunk@335 bb408c1c-ae56-11e1-83d9-df6b3e0c105e

git-svn-id: https://camplinux.in.tum.de/svn/campvis/trunk@326 bb408c1c-ae56-11e1-83d9-df6b3e0c105e

 * 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