Returns all require
s-objects of a param set as a list.
getRequirements(par.set, remove.null = TRUE)
[ParamSet
]
Parameter set.
[logical(1)
]
If not set, params without a requires-setting will result in a NULL
element in the returned list,
otherwise they are removed.
Default is codeTRUE.
[named list
].
Named list of require-call-objects, lengths corresponds to number of params (potentially
only the subset with requires-field), named with with param ids.