Import CHECKSUM_ALGOS from bdbag.bdbagit

[nsoranzo]

Missed in commit 6175ec342f92c1ecb06189be3c6ec61b89bfc52a

[coveralls]

Pull Request Test Coverage Report for Build 240

• 1 of 1 (100.0%) changed or added relevant line in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 92.588%

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Totals
Change from base Build 239:	0.0%
Covered Lines:	1449
Relevant Lines:	1565

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💛 - Coveralls

[mikedarcy]

Oops. Thanks for catching this @nsoranzo . Unfortunate this did not get caught in the unit tests. I will have to look into that. Merging PR.