compare_scenarios: Compare scenarios
In WDNR-Water-Use/CSLSscenarios: CSLS MODFLOW Scenario Analysis

This function compares two time series and evaluates the second series for ecologically significant differences from the first.

compare_scenarios(
  df1,
  df2,
  metric_uncertainty,
  rules = CSLSscenarios::ecological_rules,
  bathymetry = CSLSdata::bathymetry
)

`df1`	data frame with baseline hydrologic metrics
`df2`	data frame with hydrologic metrics of scenario being evaluated for significant impact.
`metric_uncertainty`	data frame with lake, metric, variable, and allowable "difference" due to uncertainty in the metric. Currently evaluated as the standard deviation in the "no irrigation" scenarios of the metric.
`rules`	data frame with ecological rules for ecological indicators related to hydrologic metrics.
`bathymetry`	data frame with bathymetric relationships with parameters like lake area, lake volume, plant area, etc.

comparison, a data frame with the following columns:

`lake`	name of lake
`hydrology`	type of hydrologic metric (e.g., magnitude)
`metric`	hydrologic metric (e.g., exceedance_level)
`variable`	type of hydrologic metric (e.g. "90" for 90th percentile exceedance level)
`category`	category of ecological indicator (e.g., plants, fish)
`indicator`	ecological indicator (e.g., volume_habitat)
`impacted`	logical, TRUE if this ecological indicator is impacted from baseline under this scenario
`significant_if`	notes whether scenario is significant if scenario values are "higher" or "lower" than threshold values
`value1`	base value of hydrologic metric
`threshold`	threshold value of hydrologic metric
`value2`	scenario value of hydrologic metric
`threshold_diff`	difference between threshold and base value of hydrologic metric
`diff`	difference between scenario and base value of hydrologic metric
`bathy_significant_if`	notes whether scenario is significant if scenario child/bathymetric values are "higher" or "lower" than child/bathymetric threshold values
`bathy1`	base value of child/bathymetric metric (if applicable)
`bathy_threshold`	threshold value of child/bathymetric metric (if applicable)
`bathy2`	scenario value of child/bathymetric metric (if applicable)
`bathy_threshold_diff`	difference between bathy_threshold and bathy1
`bathy_diff`	difference between bathy2 and bathy1