* lisp/org.el (org-reverse-string): Add `org-reverse-string' to
reverse a string.
* lisp/org-id.el(org-id-new, org-id-decode): Replace
`org-id-reverse-string' by `org-reverse-string'.
* lisp/ob-core.el(org-babel-trim): Replace `org-babel-reverse-string'
by `org-reverse-string' and declare it.
TINYCHANGE