Data aggregation - Advanced Option

jirikadlec2[CodePlex]
In Aggregation settings, change the settings to simple (that is the current dialog) and Advanced.

In Advanced, add the following options:
Type of aggregation (same as now)
Variable (same as now)
Aggregation Interval: Calendar Year, Hydrologic Year, Quarterly, Monthly, Daily, Seasonal-Monthly, Seasonal-Daily

Decimal places option
Save data as option: New column for each interval / New layer for each interval
If aggregation interval Monthly is selected and New column for each interval is selected, then create a new layer with a new column for every month.

If aggregation interval Monthly is selected

Start by locating the Aggregation settings dialog and the existing aggregation implementation. Review how the current type and variable options are handled before defining the Simple and Advanced settings, interval choices, decimal places, and column-versus-layer output. Done means the requested options and monthly output behavior are implemented, with the incomplete requirements clarified.

Written by the indexing model from the issue text.