Retrieving a list of links from an ObservationCollection object.

[tristandijkstra]

Hi,

Related to these two PRs i'd like to retrieve a list of linkDefinitions from an observation collection. Below is an example of how I currently do it.

tudat-team/tudatpy-examples#28
#110

# Transform the MPC observations into a tudat compatible format.
observation_collection, links = batch.to_tudat(bodies=bodies)

# set create angular_position settings for each link in the list.
observation_settings_list = list()
for link in list(links.values()):
    observation_settings_list.append(observation.angular_position(link))

[DominicDirkx]

Functionality has been added with latest commit to develop:

c967acb

and associated commit to tudat develop branch.

The new ObservationCollection.get_link_definitions_for_observables function (with observable type as input) returns a list of LinkDefinition objects used for that observable