changed a definition to a declaration

git-svn-id: http://svn.code.sf.net/p/netgen-mesher/code/netgen@863 38e36fca-e102-11dd-b6c5-65a6809f2f0c
removed empty Render() function

git-svn-id: http://svn.code.sf.net/p/netgen-mesher/code/netgen@864 38e36fca-e102-11dd-b6c5-65a6809f2f0c
added new cpp file visualpkg.cpp

git-svn-id: http://svn.code.sf.net/p/netgen-mesher/code/netgen@865 38e36fca-e102-11dd-b6c5-65a6809f2f0c
adaptions for opengl drawing from python

git-svn-id: http://svn.code.sf.net/p/netgen-mesher/code/netgen@866 38e36fca-e102-11dd-b6c5-65a6809f2f0c