Use np.asarray instead of np.array as far as possible to avoid unnecessary copying of arrays. Also shortened creation of POLARIZATION_TYPE array.
Use np.asarray instead of np.array as far as possible to avoid unnecessary copying of arrays. Also shortened creation of POLARIZATION_TYPE array.

git-svn-id: 88c9ca70625627825018ef89be83f0d41a8e4cf1@9363 b56c7a7d-ac47-0410-a905-b6f7de78896a

ska-sa/katdal