Sort Chem Table Ignoring Leading Number

**[Original report](https://bitbucket.org/laborstudents/chemical-inventory-new/issue/120) by Kye Hoover (Bitbucket: [eykrevooh](https://bitbucket.org/eykrevooh), GitHub: [eykrevooh](https://github.com/eykrevooh)).**

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The Chem Table currently sorts everything by its leading character. We need to ignore the leading character if it is not a char in the alphabet.

Start by locating the Chem Table sorting entry point and inspect how its leading character is selected. Reproduce the current ordering with entries whose first character is non-alphabetic, then verify that sorting uses the first alphabetic character while alphabetic-leading entries remain unchanged.

Written by the indexing model from the issue text.