Tooling for subsetting climatology

[aaTman]

Our climatology is set up as (hour, dayofyear, latitude, longitude) but has some clerical problems to solve:

• scores needs the climatology to match the dimensions of the forecast and target data
• We require the case's year to transform the data using utils.convert_day_yearofday_to_time. This will not work if the case extends between two years
• We insert the climatology along with creating the metrics; the subsetting should happen inside EWB and not prior

[linear]

EWB-92