TunaMage algorithm uses it's preferred reference systems if there is
data for them.
Added table of distances for selected row.
Can edit all systems when setting distances. Extra systems are added as
necessary. Unrecognised systesm are not used for trilateration but the
data is stored.
Stores optional contributor name.
Warnings on duplicate system names and not enough distances.
Minor changes.
Updated data.
Derived systems are no longer used in trilateration