testCFSv2_grids.sh: re-enable gridType=8,9 tests

- Refs #1371
LatticeTiling: use platform-independent format specifier for uint64_t
glue.ligolw:  fix character data in external namespaces

- this patch fixes acceptance of character data in documents containing
  multiple name spaces (e.g., ligolw + voevent)
- this probably also increases parsing performance a bit