Added display of surface gravity to those landable planets that have the information available.
Added display of surface gravity to those landable planets that have the information available.

Note that looking back through history seems to show a lot of EDSM-loaded systems that don't have a gravity available.

jthorpe4/EDDiscovery,jgoode/EDDiscovery,jgoode/EDDiscovery,mwerle/EDDiscovery,mwerle/EDDiscovery