The insert/delete mechanism is now functional; but Undo is not yet.
Fixed a bug in pp_AttrProp::cloneWithEliminate Tomas files: fl_DocListener.cpp, fl_SectionLayout.cpp, fp_Run.h/cpp, fp_TextRun.cpp, ap_StringId.h, fv_View.cpp, fp_Fields.h, pt_PT_DeleteStrux/Span.cpp, pp_AttrProp.cpp
