Increase visibility of attributes in Abstract and Numerical propagator builders
Some attributes of the AbstractPropagatorBuilder and
NumericalPropagatorBuilder classes are private and it would be useful to
add some getters to know their values.
For example the value of µ in the AbstractPropagatorBuilder or the list
of force models in NumericalPropagatorBuilder cannot be known
directly.
I suggest we add getters for all the attributes of these 2 classes so
that we can access their values directly.
Also I would like to make the method "findByName" of
ParameterDriversList class public (it is currently private).
I happened to reproduce its behaviour lots of times (looping on the
drivers of the list and select one by its name) and it would be nice to
be able to use the method directly.
(from redmine: issue id 425, created on 2018-04-17, closed on 2018-06-04)