fixing compiler warnings for Babel functions

* lisp/ob-R.el (ess-local-process-name): This variable wasn't known to
  be defined.
* lisp/ob-lisp.el (org-babel-lisp-dir-fmt): This defcustom now has a
  group specified.
* lisp/ob-tangle.el (org-bracket-link-regexp): This variable wasn't
  known to be defined.
  (org-babel-tangle-combine-named-blocks): Roll my own version of a
  forbidden common lisp function.
* lisp/ob.el (org-babel-sha1-hash): Using a non-deprecated version of
  called-interactively.

lisp/ob-R.el

@@ -51,6 +51,7 @@
 (defvar org-babel-R-command "R --slave --no-save"
   "Name of command to use for executing R code.")
 
+(defvar ess-local-process-name)
 (defun org-babel-edit-prep:R (info)
   (let ((session (cdr (assoc :session (nth 2 info)))))
     (when (and session (string-match "^\\*\\(.+?\\)\\*$" session))

lisp/ob-lisp.el

@@ -45,7 +45,9 @@
   "(let ((*default-pathname-defaults* #P%S)) %%s)"
   "Format string used to wrap code bodies to set the current directory.
 For example a value of \"(progn ;; %s\\n   %%s)\" would ignore the
-current directory string.")
+current directory string."
+  :group 'org-babel
+  :type 'string)
 
 (defun org-babel-expand-body:lisp (body params)
   "Expand BODY according to PARAMS, return the expanded body."

lisp/ob-tangle.el

@@ -279,6 +279,7 @@ references."
                    (save-excursion (end-of-line 1) (forward-char 1) (point)))))
 
 (defvar org-stored-links)
+(defvar org-bracket-link-regexp)
 (defun org-babel-tangle-collect-blocks (&optional language)
   "Collect source blocks in the current Org-mode file.
 Return an association list of source-code block specifications of
@@ -389,10 +390,13 @@ same name in the order they appear in the file."
 			     (nth 5 spec)
 			     (let ((named (mapcar
 					   (lambda (el) (nth 5 el))
-					   (remove-if
-					    (lambda (el)
-					      (not (equal name (nth 3 el))))
-					    (cdr by-lang)))))
+					   (delq
+					    nil
+					    (mapcar
+					     (lambda (el)
+					       (when (equal name (nth 3 el))
+						 el))
+					     (cdr by-lang))))))
 			       (case org-babel-tangle-named-block-combination
 				 (append (mapconcat #'identity
 						    named ""))

lisp/ob.el

@@ -752,7 +752,7 @@ the current subtree."
     (setf (nth 2 info)
 	  (sort (copy-sequence (nth 2 info))
 		(lambda (a b) (string< (car a) (car b)))))
-    ((lambda (hash) (when (interactive-p) (message hash)) hash)
+    ((lambda (hash) (when (called-interactively-p 'interactive) (message hash)) hash)
      (sha1 (format "%s-%s"
 		   (mapconcat
 		    #'identity