LiveLog: Use large data fields for speed and heading


git-svn-id: http://svn.code.sf.net/p/qlandkartegt/code/QLandkarteGT/trunk@3962 d0c010d8-bb82-477e-a075-112140230451
git-svn-id: http://svn.code.sf.net/p/qlandkartegt/code/QLandkarteGT/trunk@3963 d0c010d8-bb82-477e-a075-112140230451