Investigate vector-valued data

[uekerman]

Currently seems unsupported, meaning we only take the first entry:

fmi-runner/fmiprecice/runner.py

Lines 203 to 210 in d6c605a

	# Convert data to list for FMU
	if participant.get_data_dimensions(mesh_name, read_data_name) > 1:
	# why does this work with one-entry vectors? A (1,2) vector is written on a single scalar FMU variable.
	# This is not correct
	# The program should abort if data_type = vector and the number of entries
	# in vr_read / vr_write do not match the number of elements in read_data / write_data
	# preCICE aborts for write_data() with the wrong dimensions, that is ok for now
	read_data = read_data[0]