Implemented PIKE_T_ATTRIBUTE type nodes. Added push_type_attribute(). Added use and documentation of CompilationHandler()->handle_attribute_constant() when attributed parameters are encountered with constant values. low_new_check_call() now takes an svalue as the fourth argument. Fixed bug in get_first_argument_type() for anded function types. Added register_attribute_handler(). Added efuns __register_attribute_handler() and __handle_attribute_constant(). The efun __low_check_call() now takes a fourth argument. Rev: src/builtin_functions.c:1.637 Rev: src/pike_types.c:1.293 Rev: src/pike_types.h:1.105