* org.texi (Using the mapping API): Fix bug in mapping example.
(Publishing options): Make the list of properties complete again, in
correspondence to the variable `org-export-plist-vars'.
(Property searches): Document new special values for time comparisons.
(Tag inheritance): Refine the description of tag inheritance.
(Project alist): Add info about the publishing sequence of components.
(Effort estimates): Document the new relativer timer.