Runtime Calculator for generating .apsimx files from .txt config files

• This calculator will assist you with selecting the number of sets (nSets) while updating the 03-generate-config-files/generate_apsim_configs.R ( as described in https://nesi.github.io/APSIM-HPC/#03-generate-config-filesgenerate_apsim_configsr)
• This will calculate the number of Sets where each set will process configfiles within 24hours