Incorporate outlier detection

[cailadd90]

Details of what's changed:

• a new function has been added to identify outliers (in processed data by day/event/tide) and optionally remove them based on +/- 1.5 of the 25th and 75th percentile.

What needs to be done:

• [ ] Incorporate into hydro_v2

[mcwimm]

Should this be integrated as filter option, i.e., Data>Filter?

[mcwimm]

Not needed anymore