added some information in the gps use cases, needs to be prioritised 
added some information in the gps use cases, needs to be prioritised 

svn path=/trunk/KDE/kdeedu/marble/; revision=673289

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