Default context menu added for algebra view - half way: it doesn't close yet, when needed. (#3276)

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@26182 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Redundant superinterface removed.

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@26183 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Only one context menu appears for algebra view at the same time. (#3276)

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@26184 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
[giac] fix for limit(n!^(1/n)/n,n,inf)

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@26185 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e