More data for plan2adapt

[corviday]

In addition to the "p2a_classic" datasets matchign the functionality of the old plan2adapt, there have been suggestions to add the following additional data to plan2adapt:

• [ ] suETCCDI variable (&PCIC12)
• [ ] tasmax
• [ ] tasmin
• [x] Cooling Degree Days
• [ ] SU25
• [ ] 1970-2000 baseline for all variables

Trevor has suggested including the first three in the summary tab, and multiple people have pointed out that 1970-2000 is the baseline used in most current PCIC calculations since p2a was first released.

These are medium-priority for p2a.

[corviday]

• [ ] ~cumulative precipitation - replace regular precipitation~
• [ ] ~cumulative precipitation as snow - replace regular prsn~

After further discussion, @rod-glover and I think this can be handled entirely as a matter of presentation in the front end, and does not require new datasets to be created.

[corviday]

The 1971-2000 baseline is created and available in the database, but the current stored query script allows only a single baseline, so percentileanomaly is still stuck with 1961-1990. We'll need to update the script to support two baselines, then update the front or back end to use the one we want, if we want to switch over without any outage.