make detach function virtual so that GeoDataPoint's detach function is called instead
make detach function virtual so that GeoDataPoint's detach function is called instead

svn path=/branches/work/marble-geodata-nt/marble/; revision=923036

quannt24/marble,probonopd/marble,adraghici/marble,tzapzoor/marble,AndreiDuma/marble,quannt24/marble,quannt24/marble,tzapzoor/marble,tzapzoor/marble,utkuaydin/marble,oberluz/marble,probonopd/marble,tzapzoor/marble,adraghici/marble,oberluz/marble,utkuaydin/marble,Earthwings/marble,adraghici/marble,tzapzoor/marble,probonopd/marble,Earthwings/marble,probonopd/marble,tucnak/marble,rku/marble,rku/marble,rku/marble,tzapzoor/marble,Earthwings/marble,adraghici/marble,tucnak/marble,AndreiDuma/marble,utkuaydin/marble,rku/marble,tucnak/marble,AndreiDuma/marble,quannt24/marble,David-Gil/marble-dev,probonopd/marble,David-Gil/marble-dev,tzapzoor/marble,adraghici/marble,probonopd/marble,rku/marble,tucnak/marble,oberluz/marble,Earthwings/marble,Earthwings/marble,probonopd/marble,utkuaydin/marble,oberluz/marble,David-Gil/marble-dev,utkuaydin/marble,quannt24/marble,oberluz/marble,adraghici/marble,utkuaydin/marble,tzapzoor/marble,AndreiDuma/marble,David-Gil/marble-dev,David-Gil/marble-dev,AndreiDuma/marble,David-Gil/marble-dev,tucnak/marble,AndreiDuma/marble,quannt24/marble,Earthwings/marble,tucnak/marble,oberluz/marble,quannt24/marble,rku/marble,tucnak/marble