Replace local_size which has been deprecated in deal.II with locally_owned_size
Rename and rework the functions to read and set experimental data. In particular, I've fixed the way the data is set, instead of looking at each simulation point and searching the closest data point, I do the opposite. This way only the simulation points that are the closest to a data point gets set. The other entries are left untouched. I also return the result from ArborX so that you can use it to build H.
This PR has three commits:
local_size
which has been deprecated in deal.II withlocally_owned_size