What data to provide in a CompoundDb

[jorainer]

Based on https://github.com/stanstrup/PeakABro I'm extracting the following information:

• id (column "compound_id")
• name (columns "compound_name").
• inchi
• formula
• mass

Is there anything else that might at some point be interesting? @stanstrup? @SiggiSmara?

Also, I renamed id into compound_id and name into compound_name to avoid potential column name clashes and specify for what type of entity the id and the name is. @stanstrup, that OK with you?

[stanstrup]

Sure, no problem.