page numbering and the references of the master file are maintained in the included children (bug 1005).
I made this optional since some people use \includeonly to save compilation time, but a proper aux file update
needs a full compilation of the complete master prior to the compilation of the \includeonly master.
Hence, a new buffer param is introduced (file format change).
git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@32936 a592a061-630c-0410-9148-cb99ea01b6c8