(add-hook): Initialize default value and local value.

(add-hook): Initialize default value and local value.
(run-hook-with-args-until-success): New function.
(run-hook-with-args-until-failure): New function.

(run-hooks): t as hook list element means run the global
value of the variable as well as the local value.
(run-hook-with-args): Likewise.
(make-local-hook): New function.
(add-hook, remove-hook): New arg LOCAL means modify local value.
Test default-boundp as well as boundp.