[giac] Fix solve((x)^((123/100))=2,x)

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@34835 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@34836 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
SolveQuartic working for most cases

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@34837 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e