Added
- Ternary and Quarternary branching is now possible. Monomers may have up to four children in the tree-like structure
of a glycan.
- More tests for the new functionality
- Support for two new IUPAC representations (full and simplified according to
[SNFG](https://www.ncbi.nlm.nih.gov/glycans/snfg.html)) beside the current IUPAC-condensed
- Now supporting most of the functional groups in
[CSDB](http://csdb.glycoscience.ru/snfgedit/snfgedit.html?expert=1&destination=structure) and
[glycowork](https://pypi.org/project/glycowork/).
Changed
- Monomers only in RDKit representation possible. NetworkX-implementation has been removed
- Adding of functional groups completely reworked
- Comments and code style improved, also a bit of a cleanup
- Default output-type is ``return`` instead of commandline prints
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