Runtime data now collected in dataframes

Makefile

Manifest.toml

Project.toml

src/Persefone.jl

src/analysis/analyse_nature.R

src/core/output.jl

src/core/simulation.jl

src/crop/farmplot.jl

src/nature/ecologicaldata.jl

src/parameters.toml

test/io_tests.jl

test/simulation_tests.jl

test/test_parameters.toml