Lexichem TK 2.9.0

Minor bug fixes

• Custom polymer naming was added in the molecule-to-name workflow to avoid memory overflow when reading in large polymers.

• Kekulization was added in the molecule-to-name workflow to ensure that the same aromatic structures produce the same names.

• Support was added for some cases of complex (bis-, tris-, tetrakis-, etc.) multipliers in the molecule-to-name and name-to-molecule workflows.