[fixed] Remove spurious field NodeIdentifier.mLayout2D hiding Node2D.mLayout2D; add getter/setter for Node2D.mLayout2D.
[added] Add bipartite layout (LayoutBipartite2D) adapted to MAP graphs; add menu entry 'Layout' to switch between layouts; mark active look-and-feel in menu entry 'Theme' at startup
[changed] Improve bipartite layout code; improve graph redraw function (scatter nodes around center); change node picking/dragging behavior (pin node only if CTRL is pressed at button release).
[fixed] Use alpha channel for transparency gradient of glow effects for new or deleted nodes.
[changed] Improve node placement in bipartite layout.
[changed] Move LayoutType and MetadataCollocation from package graphCalculator.jung to package graphCalculator.
[fixed] Remove spurious field NodeIdentifier.mLayout2D hiding Node2D.mLayout2D; add getter/setter for Node2D.mLayout2D.
[added] Add bipartite layout (LayoutBipartite2D) adapted to MAP graphs; add menu entry 'Layout' to switch between layouts; mark active look-and-feel in menu entry 'Theme' at startup
[changed] Improve bipartite layout code; improve graph redraw function (scatter nodes around center); change node picking/dragging behavior (pin node only if CTRL is pressed at button release).
[fixed] Use alpha channel for transparency gradient of glow effects for new or deleted nodes.
[changed] Improve node placement in bipartite layout.
[changed] Move LayoutType and MetadataCollocation from package graphCalculator.jung to package graphCalculator.
Merge branch 'newGraphLayout' of https://github.com/trustathsh/visitmeta into newGraphLayout

Conflicts:
	visualization/src/main/java/de/hshannover/f4/trust/visitmeta/graphDrawer/Piccolo2DPanel.java