Remove generated files
Remove comments, they can be retrieved from git history
Remove dependency on geiger

This package does not seem to be used.
Revert: remove the item "model" in the results which is always returning "birth-death" (useless)

This reverts commit 729044365411c2f5ab561abd9e815248e8f81463.
Other fit functions do return another model, we will see later if we
drop or keep it.
replaced 'x' by 't' within the lambda/mu functions because there are time functions
Added fit_env_bd. Ongoing work
Updated DESCRIPTION & NAMESPACE: pspline is mandatory (fit_env_bd)
added associated documentation to fit_env_bd. The documentation is similar to fit_bd, except additional informations of dof/env_data. The objective of this add is the ability to build a model & test fit_env_bd. WIP
Made likelihood_coal_cst_mod & likelihood_coal_exp_mod private
Added new methods fit_coal_cst and its associated likelihood_coal_cst. Ongoing work
Minor bugfix: likelihood_coal_cst is not private
Removed R/fit_coal_cst_mod.R & R/fit_coal_exp_mod.R since their fusion into R/fit_coal_cst.R
Added Paleotemperature dataframe
added corresponding documentation of inferred temperature
[doc] Changing example of fit_env_bd
Added associated documentation of fit_cosl_cst function. This is issued by a copy of fit_coal_exp_mod with some modifications. Ongoing work
Added associated documentation of likelihood_cosl_cst function. This is issued by a copy of likelihood_coal_exp_mod with some modifications. Ongoing work
minor changes with likelihood_cst documentation
Remove comments, they can be retrieved from git history
Remove man/*_mod.Rd, R files have already been removed