Library ideas

[ctk3b]

• [x] A library of elements with ports attached to them. The default would be to have a ports oriented in the most common orientations. E.g. hydrogen with one port, oxygen with two ports in opposite directions, carbon with ports forming a tetrahedron.
• [x] A library of common organic building blocks with ports attached to them. E.g. methyl, carbonyl, amine etc.

It may make sense to host the library in a separate repo, especially if it begins to grow in size.

[ctk3b]

Libraries are sort of there. Things to think about:

• "import all" structure to easily get access to everything without typing out the full import
• Functionality to search and filter through the compounds
• Long term plans for storing and indexing. I suspect a folder in the git repo might not make it super far.

[ctk3b]

Hook up with pubchem: https://github.com/mcs07/PubChemPy and CIR https://github.com/mcs07/CIRpy

[CalCraven]

I think this issue is still relevant. Until this library get's too big, we can continue to host it in mbuild/lib/atoms. This is something we could assign a good first PR for.