add max_temp_2in to Crop Event to support peanuts
Allow max_temp_2in to be null, and set null as the default
Add 'max_temp_2in' field to Django admin view of CropEvents.
Update verbose name for max_temp_2in.
Improve max_temp_2in description
Show comment field on CropEvent admin page.
Add db migration 18.
Show all alerts in a single column.
Add irragation message to CropEvent table.  Add irrigate_to_max field to WaterRegister table. Rename WaterRegister.description to WaterRegistration.message.  Show irrigation_message from CropEvent table on WaterRegister page.   Implement two-pass calculation for WaterRegister table.  etc.