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[FIX #289] raised shader version levels to 130 to fix some issues with more strict glsl compilers due to features we use which where not available in 120.

introduced before.

[FIX #295] now also the original dataset color gets restored when no ROI is available anymore. This was broken since the last commit.

[FIX #295] now dynamic updating of ROI branch colors works again. Swithing back to original daraset coloring not yet done.

[STYLE #42] fixed style of butterfly module. Unfortunately I commited the module of my student before I had told him about the style conventions. The current version probably has problem regarding -1 due to my change of type.

[ADD #293] added new functionality to create flat shaded surface from triangle mesh and use the functionality in module

[ADD #291] allow disconnects via mouse: double-click on connector or arrow or drag the connection arrow away.