Automatic update of propset svn:ignore via for svnignore.txt's by svnignore

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@38025 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Avoid adding the same GUI twice

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@38026 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Allow resetting search from API / command SetPerspective

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@38027 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e