python package installation

git-svn-id: http://svn.code.sf.net/p/netgen-mesher/code/netgen@852 38e36fca-e102-11dd-b6c5-65a6809f2f0c
windows fixes

git-svn-id: http://svn.code.sf.net/p/netgen-mesher/code/netgen@853 38e36fca-e102-11dd-b6c5-65a6809f2f0c
windows fixes

git-svn-id: http://svn.code.sf.net/p/netgen-mesher/code/netgen@854 38e36fca-e102-11dd-b6c5-65a6809f2f0c
windows fixes

git-svn-id: http://svn.code.sf.net/p/netgen-mesher/code/netgen@855 38e36fca-e102-11dd-b6c5-65a6809f2f0c