`pylcaio.LCAIO.identify_rows`

[michaelweinold]

Documentation:

• [ ] add data input/output format documentation
• [ ] add mathematical formulation of data manipulation

Refactoring:

• [x] implement function using native Pandas/NumPy objects and methods
• [ ] document performance improvements
• [ ] create MWE input/output data for unit test

[michaelweinold]

Best to use rower instead of re-implementing the functionality of identify_rows() again: Compare the rower documentation and the rower data directory.