change log for meshes3d

meshes3d release 2011.06.30
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Important changes:
- Package has been splitted up into 'geom3d' and 'meshes3d'. See changelog of
    "geom3d" package for older revisions

New Functions
- added function clipMeshVertices
- added function computeMeshEdges

Bug Fixes
- fixed bug in edge labeling of createCubeOctaedron