Bug 1237: While migrating from WGS84 to ITRF coordinates we also change the...

Bug 1237: While migrating from WGS84 to ITRF coordinates we also change the way the antennapositions
and antenna (subset) configurations are defined. The AntennaArrays.conf file will be replaced with an
AntennaPos.conf file containing the positions of the physical antennas and a AntennaSets.conf file
containing the several subsets. For each subset the RCU input must be specified for each stationtype.
This gives us maximum flexibility in defining subsets (although it might be hard to specify too weird sets).