MAJOR interpolate bugfix. vorticity budgets making use of interp1q till now ARE VERY WRONG. I forgot to permute order before reshaping resulting in non-monotonic z-vectors being sued for linear interpolation
vorticity + csdye animation for comm meeting-2
more efficient bottom area / vorticity calculation. I calculate a mask the first time and then reuse it later
minor update to plot_bathy. explicitly passing color as string argument lets me use both letters and RGB vector to specify color