v0.91.6

Oceananigans v0.91.6

Diff since v0.91.5

Merged pull requests:

• (0.91.6) Distributed FFTs using Oceananigans' inhouse DiscreteTransforms (#3279) (@simone-silvestri)
• Add Downloads badges on README.md (#3652) (@navidcy)
• Update number_type.md (#3671) (@simone-silvestri)
• Update time_step! docstring for AB2 (#3674) (@simone-silvestri)
• Eliminate extra docstrings for FunctionField (#3678) (@glwagner)

Closed issues:

• What's the point of neglecting the computation of tendencies when taking a time-step? (#3565)