; and , are left, because this way it may be possible to fix an error later... but put error messages

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@36491 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Automatic update of propset svn:ignore via for svnignore.txt's by svnignore

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@36492 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
NPE fix for images

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@36493 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
I almost believed that it does not work with this changeset either, but if I switch off the sensor only when GeoGebra is ready to accept it, then it seems OK. So, it's possible that the problem was the same previously as well: in high frequency, GeoGebra cannot take over the sensor, and seems to send old values... so this needs more testing

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@36494 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e