Tcl does not support packages with digits in their names.  We map module
names containing digits to alternative names for Tcl packages.
Generalize the existing hard-coded mappings to use a per-module declared
"TCL_NAME" instead.  Add a mapping for vtkIOXdmf2 -> vtkIOXdmfII.

Change-Id: I2a6d708eadd746191a77b5efdd1a4385dad73810