Make a flexible reservoir operations plotting function

[TrevorJA]

• Plotting function for reservoir dynamics
  • A flexible function that, for any of the Pywr-DRB reservoirs, makes a 3-panel figure with simulated:
    • Inflow, Storage, Outflow
    • STARFIT Normal Operating Range (NOR) as a background in the storage panel
  • Options to plot observed data when available.
  • Test and make sure it works for every reservoir in the model

[MarilynSmith1]

Plotting function can be viewed here on this commit 7f7dcea2f623af723abaa73d03538663a579ab73

[MarilynSmith1]

After the storage data implementation, will be updating this script to call in the observed data when available