Added Simple BKTable Math to BKit

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Today I finished up a lot of little things at work... got some hardware re-tasked so that we can decommission some, got a few little things updated, etc. Then this afternoon I spent some time adding in some simple mathematical operations to the BKTable - add, subtract, multiply, divide, transpose, inverse - enough so that I could then add these methods to the BKJEP parser and then tables could model matrices and do some simple linear algebra.

Nothing amazing, I'll agree, but it's nice and it adds a level to the JEP parser that has been missing up to now.