add metabolite and reaction annotations

[edkerk]

Add more annotations (KEGG, ChEBI, lipidmaps, InChi) for all metabolites. Now we mostly rely on annotations from the yeast consensus network.

• [x] query latest yeast-GEM for new annotations
• [ ] pass through MetaNetX to find additional annotations
• [ ] evaluate alternative solutions, like ModelPolisher

[ChristianLieven]

You could try out https://github.com/draeger-lab/ModelPolisher for this.

[edkerk]

Thanks @ChristianLieven, will have a look at this!