Restore completion over the most important keywords
* org-pcomplete.el (pcomplete/org-mode/file-option/x):
Resurrect. Use `org-default-options' to initialize completion
fonctions for the most important keywords.
* org-macs.el (org-default-options): Rename and adapt from
`org-get-current-options'.
This is a partial revert of
e14cf780 feature-wise. The idea is
that it may be useful to get completion, even when it ends up with
the default value, because the user may want to adapt the default
values instead of re-typing them.