Removed definition of URL for "qt" namespace from individual parts of the model, and instead define it once at the top.
This is the way that Bob's tools generate a v3 sys defn, and it brings the auto generated one in sync with the one usable in the build.
Also added a v3 system definition for S^4, although it's not quite in sync with the v2 sys defn there (because that's not in sync with the generated sys defns at the moment).
source,dst,type,pattern,sysdef
http://developer.symbian.org/oss/FCL/sftools/fbf/utilities/,/utilities,branch,default,
http://developer.symbian.org/oss/FCL/sf/os/deviceplatformrelease/,/sf/os/deviceplatformrelease,branch,S3_LATESTGOOD,layers.sysdef.xml
http://developer.symbian.org/oss/FCL/sf/os/kernelhwsrv/,/sf/os/kernelhwsrv,branch,S3_LATESTGOOD,layers.sysdef.xml
http://developer.symbian.org/oss/FCL/sf/os/buildtools/,/sf/os/buildtools,branch,S3_LATESTGOOD,layers.sysdef.xml