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Avoid setting the default view mode each time the options widget has been quit via "Ok" or "Apply" button. Also avoid reset of toolboxes.

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- Ignoring whitespaces in filenames.
- Converting object names of groups to valid .obj-filenames (important for saving of settings file)

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GLMatrixT: assertion assert(r_l > 0.0 && t_b > 0.0  && f_n > 0.0) in function ortho(...) disabled since it is violated by every 2d object with image coords

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Implemented reading and writing of PLY files. Plugin-FilePLY is now completely independant from OpenMesh::IO::read() and write().

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