update S^3 sources.csv to point to latest drop (on FCL) and add stem to model (but no rom build yet)
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