Column name parsing fail for multiple-dot names

[hombit]

Bug report

I have a column name "R.A." and lsdb.from_dataframe() fails

File /ocean/projects/phy210048p/malanche/lsdb-tests/cenv/lib/python3.11/site-packages/nested_pandas/nestedframe/core.py:58, in NestedFrame._is_known_hierarchical_column(self, colname)
     56 """Determine whether a string is a known hierarchical column name"""
     57 if "." in colname:
---> 58     left, right = colname.split(".")
     59     if left in self.nested_columns:
     60         return right in self.all_columns[left]

ValueError: too many values to unpack (expected 2)

We probably should count dots or unpack it safer, e.g. with left, right, *others = colname.split(".")

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[gitosaurus]

Note that this particular bug appears to have been fixed by @dougbrn in commit 1cde0c1. #177 changed the method, and didn't regress.