Added support of numpy integers as __get/setitem__ indices


git-svn-id: http://pyrap.googlecode.com/svn/trunk@352 80e5cd9e-5d28-0410-a7fc-3f808f404835
Fixed typo

git-svn-id: http://pyrap.googlecode.com/svn/trunk@353 80e5cd9e-5d28-0410-a7fc-3f808f404835
Added support for context manager idiom (with statement)

git-svn-id: http://pyrap.googlecode.com/svn/trunk@354 80e5cd9e-5d28-0410-a7fc-3f808f404835