fixed rounding error in ClippedSurfaceBoundsCalculator, added new input-method
extended ClippedSurfaceBoundsCalculatorTest
Merge branch 'bug-13809-corrected-bounds-clipping'

Conflicts:
	Core/Code/Algorithms/mitkClippedSurfaceBoundsCalculator.cpp
	Core/Code/Algorithms/mitkClippedSurfaceBoundsCalculator.h
	Core/Code/Testing/mitkClippedSurfaceBoundsCalculatorTest.cpp
Check object's validity before erasing

* check if the map holding planar figures is not empty before searching
* test the iterator returned by find() method for != map::end
Merge branch 'bug-13985-Crash-on-deleting-measurement-objects'
handling images with b0 volumes at arbitrary positions
Merge branch 'bug-13771-FiberTransformations'
Fixed disabled crosshair interaction after removing uninitialized planar figure
Merge branch 'bug-13993-no-crosshiar-movement-possible-after-removing-planarfigure'

Conflicts:
	Plugins/org.mitk.gui.qt.measurementtoolbox/src/internal/QmitkMeasurementView.cpp