Backport commit c75f505de from Emacs

Backport commit c75f505de from Emacs

* lisp/org-agenda.el (org-agenda-to-appt):
* lisp/org-clock.el (org-clock-resolve-clock)
(org-clock-resolve, org-resolve-clocks-if-idle):
* lisp/org-colview.el (org-columns-edit-value, org-columns)
(org-agenda-columns):
* lisp/org-element.el (org-element--cache-interrupt-p)
(org-element--cache-sync):
* lisp/org-habit.el (org-habit-get-faces)
(org-habit-insert-consistency-graphs):
* lisp/org-indent.el (org-indent-add-properties):
* lisp/org-timer.el ((org-timer-show-remaining-time):
* lisp/org.el (org-babel-load-file, org-current-time)
(org-today, org-auto-repeat-maybe)
(org-small-year-to-year, org-goto-calendar):
* lisp/ox.el (org-export-insert-default-template):
Use nil instead of (current-time) where either will do, as nil is
a bit more efficient and should have less timing error.

Prefer nil to (current-time) when either works
c75f505dea6a560b825384cf3d277690f86840bf
Paul Eggert
Fri Oct 20 19:42:23 2017 -0700

Note(km): The changes that will reverted in the next commit have been
dropped from the ChangeLog entries above.