Many changes, we are almost send a full run. We need now to modify constructor of agent, to distinguish between AgentA and AgentNA.
Then we need to continue unit testing with simulation, maybe adding a callback function.
After that, we are good to go.

added hamming distance for x history metrics, and changed structure of agents so that t_hist is now a Float64 (otherwise, conflicts happen because dt can be less that Float16 error)

Added interpolations function in utils.jl. Minor change on world2df, with argument `geotrait=false added`. Minor change on plot

added option "gs" for plotting, adding a gradient of colour for "3dgeo" and "3d" option in plotting, added arithmetic and geometric smoothing

Version 0.2. Changed the structure of agents, to better integrate the geotrait. Changes have telescoped to accessor get_geo that now takes t as an argument, and all the functions that are using it.

added function clean_world, and beta and alpha diversity ( to be continued). Modified Plots.plot, mainly for integrating the geotrait into option "x" and "xs"

version 0.1.8, with new documentation, old competition and birth function deleted because now passed by the used.