This function does nothing. It is intended to inherit is parameters' documentation.
default_params_doc(dt, phylogenies, step_type, time_unit)
The timestep resolution, a value bigger than zero and less or equal to one. 1/dt is the number of points that will be evaluated
a collection of one or more phylogenies, where the phylogenies are of type phylo. This collection can both be a list of phylo or a multiphylo.
when between two points, where the second point has both a higher x and y coordinat, which y coordinat to follow. 'step_type' can be:
lower maintain the y-coordinat of the leftmost point
upper already use the y-coordinat of the rightmost point
the time unit of the branching times
"ago: "the branching times are postive, as these are in time units ago
"since: "the branching times are negative, as these are in time units since present
Richèl J.C. Bilderbeek