Adding more parameter options to epicsawrap files

[lilyclements]

Reading in Parameters vs Definitions
We read in the rpicsa parameters by the "definitions" file for annual_rainfall_summaries, annual_temperature_summaries, monthly_temperature_summaries

For season_start_probabilities, crop_success_probabilities, we read in the parameters by the function in epicsawrap or by the definitions. So if the parameters are NULL we read in the definitions file, otherwise these are now parameters (see PR #17, #18).

We want to introduce this to the other functions (annual_rainfall_summaries, annual_temperature_summaries, monthly_temperature_summaries)