CheckInController Allow New Quantity To Be Larger Than Container

**[Original report](https://bitbucket.org/laborstudents/chemical-inventory-new/issue/128) by Kye Hoover (Bitbucket: [eykrevooh](https://bitbucket.org/eykrevooh), GitHub: [eykrevooh](https://github.com/eykrevooh)).**

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When checking a chemical in it allows the returned quantity to exceed the capacity of the chemicals container.

Start at the CheckInController entry point and reproduce checking in a chemical with a quantity larger than the container capacity. Trace the quantity validation and confirm the finished behavior rejects or prevents quantities exceeding that capacity.

Written by the indexing model from the issue text.