#3882 implementing begins in Web

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@30476 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Fix for #3905, related to #3857

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@30477 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Circle/ellipse and frustum : fix bugs ; use adaptative number of longitudes

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@30478 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Sphere and frustum : simpler alpha calculus

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@30479 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
#3906 the beginning.

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@30480 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e