Writing inlet profile fails with mpi + multiple inlets

[bigfooted]

Describe the bug
reported here:
https://www.cfd-online.com/Forums/su2/248779-inlet-profile-su2-fluid-mixture.html

With mpi + multiple inlets, writing an initial inlet profile fails. A related issue was solved in #1786, but this only works correctly for a single inlet profile.

It looks like the problem is in CMarkerProfileReaderFVM.cpp. The master node does not gather the information about columnNames ("Velocity-X" etc) and columnValues for all inlets (it only knows about the inlets on the rank). Then, WriteMarkerProfileTemplate fails. I think we have to do for columnNames and columnValues the same as what we do for Marker_Tags and profileTags in MergeProfileMarkers, which is SU2_MPI::Gather the information and store it in a global list for master.

[bigfooted]

PR #1999