Use local fields

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@24601 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Fix negative volume/area

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@24602 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Fix negative volume/area
Fix isInRegion for GeoQuadric3DPart

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@24603 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
temporary fix for ggbApplet.evalCommandCAS("Factor[x^2-1]")

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@24604 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e