add first ideas for FieldAlias implementation
add first ideas for FieldAlias implementation

lino-framework/lino,lino-framework/lino,lsaffre/lino,lsaffre/lino,lino-framework/lino,lsaffre/lino,lino-framework/lino,lsaffre/lino,lsaffre/lino,lino-framework/lino