Sector view & system view economy tab economic improvements

System view shows colouring of text on economy tab depending on how lucrative for trading said item is in target system for import from current system, or from target system for export to current system. Sector view has i, i+, i++ and/or e, e+, e++ depending on lucrativeness for import / export in the same kind of way.

Images available here: http://imgur.com/a/6iHMy