Insert df as an argument in fit_env_bd in the function to allow the user to modify this argument if needed
fix f.lamb.env and f.mu.env such that there can be a dependency on both time and the environmental variable
various edits to fit_env_bd help file, including change of f.lamb and f.mu such that they can be a function of both time and the environmental variable
small edits to fit_bd help file
small edits to fit_env_bd help file
remove Vtimes, not necessary. The input of phylo should be a phylogeny of class phylo and not branching times
Remove Vtimes, not necessary, see precedent commit
Specify that the model is fitted using the coalescent likelihood expression
Various edits to the fit_coal_cst help file
small edit
various edits to the fit_coal_var help file
fix N0 i the exemple file
minor edit
Various edits to the likelihood_coal_cst help file
minor edits
minor edits
various edits to the likelihood_coal_cst help file
various edits to the likelihood_coal_var help file
various edits in the examples
remove warnings when doing the optimization