more sensible naming for utlities

python_tools/void_python_tools/__init__.py

@@ -21,4 +21,4 @@ from void_python_tools.backend  import *
 from void_python_tools.apTools  import *
 from void_python_tools.plotting import *
 from void_python_tools.xcor     import *
-from void_python_tools.partUtil import *
+from void_python_tools.voidUtil import *

python_tools/void_python_tools/voidUtil/__init__.py

@@ -17,4 +17,4 @@
 #   with this program; if not, write to the Free Software Foundation, Inc.,
 #   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 #+
-from partUtil import *
+from catalogUtil import *