Make conditionally visible checkboxes not fixable

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@37646 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
#4635 inserting branch at the end of the tree

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@37647 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
fix problem with Sequence[LowerSum[x², i, i + 1, 1], i, 1, 5]

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@37648 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Make sure 3D macros use 3D AlgoManager

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@37649 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e