Restrict listing of link targets to current buffer by default

This is much faster, and usually what we want.  If references outside the
current buffer are necessary, just prefix the call with a universal argument.

site-lisp/db-org.el

@@ -661,17 +661,20 @@ not."
                 (t (user-error "Neither ID nor CUSTOM_ID given")))))
     (org-search-view nil query)))
 
-(defun db/org--get-location ()
+(defun db/org--get-location (&optional arg)
   "Interactively query for location and return mark.
-Searches through `org-agenda-files',
-`org-agenda-text-search-extra-files', and the current buffer, up
-to level 9.  If location does not have an associated mark, error
-out."
-  (let* ((org-refile-targets `((org-agenda-files :maxlevel . 9)
-                               (,(cl-remove-if-not
-                                  #'stringp org-agenda-text-search-extra-files)
-                                :maxlevel . 9)
-                               (nil :maxlevel . 9)))
+Searches through the current file, and through all of
+`org-agenda-files', `org-agenda-text-search-extra-files', and the
+current buffer, if ARG is non-nil.  Search is always conducted up
+to level 9.  If the selected location does not have an associated
+mark, error out."
+  (let* ((org-refile-targets (if arg
+                                 `((org-agenda-files :maxlevel . 9)
+                                   (,(cl-remove-if-not
+                                      #'stringp org-agenda-text-search-extra-files)
+                                    :maxlevel . 9)
+                                   (nil :maxlevel . 9))
+                                 '((nil :maxlevel . 9))))
          (mrk (nth 3 (org-refile-get-location
                       nil
                       ;; if the current buffer is associated with a file, search
@@ -695,14 +698,20 @@ prompt for an item."
            (org-with-point-at (db/org--get-location)
              (list (org-id-get) (org-entry-get nil "CUSTOM_ID"))))))
 
-(defun db/org-add-link-to-other-item ()
+(defun db/org-add-link-to-other-item (arg)
   "Interactively query for item and add link to it at point.
+
+Search through all items of the current buffer, or
+`db/org-default-org-file' if the current buffer is not associated
+with a file.  If ARG is non-nil, include all files in
+`org-agenda-files' and `org-agenda-text-search-extra-files' in
+this search.
+
 Use `org-store-link' to save link to `org-stored-links'."
-  (interactive)
+  (interactive "P")
   (unless (derived-mode-p 'org-mode)
     (user-error "Not in Org Mode"))
-  (let ((pom (db/org--get-location))
-        id item)
+  (let ((pom (db/org--get-location arg)))
     (save-mark-and-excursion
       (org-with-point-at pom
         (org-store-link nil t))