Fixed the issue with bouncing contour lines, added an optional parameter which allows the user to set the difference between contour lines

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@25636 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
[giac] fix for evalf(3^700,6)

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@25637 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Changing giac.js to the latest version in web/kickstart.xml

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@25638 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e