Remove obsolete properties from root figure object. * graphics.in.h (root_figure::properties): Remove diary, diaryfile, echo, errormessage, format, formatspacing, and language from root object. * graphics.cc (get_diary, set_diary, get_diaryfile, set_diaryfile, get_echo, set_echo, get_errormessage, get_format, set_format, get_formatspacing, set_formatspacing, get_recursionlimit, set_recursionlimit): Remove functions for setting obsolete properties of root figure object.