expanded xcs editor setpos numpy interface

modules/mol/base/pymod/__init__.py

modules/mol/base/pymod/export_editors.cc

modules/mol/base/src/editor_base.cc

modules/mol/base/src/editor_base.hh

modules/mol/base/src/entity_handle.hh

modules/mol/base/src/xcs_editor.cc

modules/mol/base/tests/test_numpy.py