better check for convexity

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@31988 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Recalc area when polyhedron is from algo pyramid/prism

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@31989 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
set() set area

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@31990 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
GeoPolygon3D.getPointsND() with algoVertex : don't set labels

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@31991 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Show created points and their labels if first input points is visible / label visible

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@31992 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e