Import string helper functions from XSLT Standard Library
Import string helper functions from XSLT Standard Library

svn path=/trunk/dom/; revision=3491

dunkelstern/libdom,Achal-Aggarwal/libdom,dunkelstern/libdom,prepare/netsurf_libdom,Achal-Aggarwal/libdom,prepare/netsurf_libdom,Achal-Aggarwal/libdom,prepare/netsurf_libdom,dunkelstern/libdom,dunkelstern/libdom,prepare/netsurf_libdom,Achal-Aggarwal/libdom,prepare/netsurf_libdom,dunkelstern/libdom,prepare/netsurf_libdom,dunkelstern/libdom,Achal-Aggarwal/libdom,Achal-Aggarwal/libdom