Use csv table

[forsyth2]

https://stackoverflow.com/questions/26609816/some-online-tool-or-automation-plugin-for-sublimetext-for-generating-sphinx-rst describes how to define the rst table using csv. We should change the implementation of generate_tables.py to do that since the rst tables are rather unwieldy.

In the current implementation, a column has to be exactly the same length in every single row, or else there will be a malformed table. For that matter, any problem with the table just shows a generic "malformed table" error which is of no use when debugging.

[chengzhuzhang]

Thanks for fixing my PR creating this issue which is a good potential solution. @TonyB9000 mentioned that he's working on a PR to streamline the simulation data table. We can probably implement some csv based solution there.