Bryn Baritompa

This follows on from https://github.com/quadratichq/quadratic/pull/128. To simplify the API it merges the `grid` cell accessor into a common `cells` accessor. It can be used as follows: ``` 1. cells[row ,...

Cell indexing counterintuitive for Pandas/Numpy users

4

Currently `cell(a, b)` refers to **column a, row b**. In Pandas and Numpy `df.iloc[a, b]` or `arrray[a, b]` refer to **row a, column b**. I think that changing the indexing...