more clean ups for #9
#9 fixes
change CASA wrap and add argo.icasa(), #9
put make_empty image in imager.py
change casa wrapper; use argo.icasa
Merge branch 'devel' of github.com:ska-sa/pyxis into devel
fix verify_antpos: import pyrap.measures before using it
Merge branch 'devel' of github.com:ska-sa/pyxis into devel