Hacked zip.js: trying to get opening remote files to work

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@26137 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Ticket #3407: fix the bug which is seen in behaviour

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@26138 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
4.9.155.0

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@26139 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
[giac] more robust error handling (check for "GIAC_ERROR:")

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@26140 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e