org.el: implement org-property-re using org-re-property
* lisp/org.el (org-re-property): Re-implement using full regex for
`org-re-property'. Add optional argument LITERAL to flag when
PROPERTY should to be regex-quoted. Move before definition of
`org-re-property'. (org-re-property-keyword): Remove, functionality
is subsumed by `org-re-property'. (org-property-re): Define using
`org-re-property'. (org-entry-get, org-property-values): Adjust
match number for PROPVAL. (org-entry-put): Use `org-re-property'
instead of `org-re-property-keyword'
This completes the refactoring started in
3c933adaf6.