* lisp/org-compat.el (org-define-obsolete-function-alias,
org-define-obsolete-variable-alias): Introduce new compatibility
macros to obsolete functions and variables.
* lisp/org-agenda.el, lisp/org-clock.el, lisp/org-id.el,
lisp/org-lparse.el, lisp/org-protocol.el lisp/org.el: Use
`org-define-obsolete-{function,variable}-alias´instead of
`define-obsolate{function,variable}-alias´.