Make barcodes strings rather than ints

[bufordrat]

Make barcodes strings rather than ints

Currently, the dibs app type-casts item barcodes into ints when it extracts them from the URL route. For example, see line 389 of dibs/server.py:

...
@dibs.get('/edit/<barcode:int>', apply = VerifyStaffUser())
...

This leads to two runtime bugs. The first, which should apply across different use cases and institutions, is that any barcode with leading zeros gets the first few digits stripped, leading dibs to query the LSP for an ill-formed barcode and throw an error. The second problem, which is likely specific to UChicago, is that barcodes for our analyze series start with an A, and thus can't be recast to ints.

In a PR coming soon, we will propose treating barcodes as strings rather than ints.