Fix for [issue 12](https://github.com/valhuber/LogicBank/issues/12) - Formulas not executed if no references to other attributes.
Also introduces `logic_row.is_inserted()` (etc), a simplest alternative to `logic_row.ins_upd_dlt == "ins"`.
1.8.3
Under VSCode (not PyCharm), rule declarations were flagged as type mismatches for derivation rules. This is corrected.
1.0.5
No longer loads not-yet-compatible SQLAlchemy 1.4.x
0.9.9
0.9.0 - Add logicRow.get_derived_attributes, which can be used to enforce behaviors such as [Unalterable Derivations](https://github.com/valhuber/LogicBank/wiki/Rule-Extensibility#unalterable-derivations).