This patch should not change behavior.  It typically omits backslashes
where they are redundant (e.g., in the string literal "^\$").
In a few places, insert backslashes where they make regular
expressions clearer: e.g., replace "^\*" (equivalent to "^*") with
"^\\*", which has the same effect as a regular expression.
Also, use ‘\ %’ instead of ‘\%’ when avoiding confusion with SCCS IDs,
and similarly use ‘\ $’ instead of ‘\$’ when avoiding confusion with
RCS IDs, as that makes it clearer that the backslash is intended.

Run admin/update-copyright.

* lisp/org/ob-abc.el (org-babel-expand-body:abc): Use dolist.
(org-babel-execute:abc): Fix regexp quoting.
* lisp/org/ob-calc.el (org--var-syms): Rename from `var-syms'.
* lisp/org/ob-lilypond.el (ly-compile-lilyfile): Remove redundant let-binding.
* lisp/org/ob-table.el (sbe): Move debug declaration.
* lisp/org/org-clock.el (org--msg-extra): Rename from `msg-extra'.
* lisp/org/org.el (org-version): Avoid var name starting with _.
(org-inhibit-startup, org-called-with-limited-levels)
(org-link-search-inhibit-query, org-time-was-given)
(org-end-time-was-given, org-def, org-defdecode, org-with-time):
* lisp/org/org-colview.el (org-agenda-overriding-columns-format):
* lisp/org/org-agenda.el (org-agenda-multi, org-depend-tag-blocked)
(org-agenda-show-log-scoped):
* lisp/org/ob-python.el (py-which-bufname, python-shell-buffer-name):
* lisp/org/ob-haskell.el (org-export-copy-to-kill-ring):
* lisp/org/ob-exp.el (org-link-search-inhibit-query):
* lisp/org/ob-R.el (ess-eval-visibly-p):
* lisp/org/ob-core.el (org-src-window-setup): Declare before use.
(org-babel-expand-noweb-references): Remove unused `blocks-in-buffer'.
* lisp/org/ox-odt.el (org-odt-hfy-face-to-css):
* lisp/org/org-src.el (org-src-associate-babel-session, org-src-get-lang-mode):
* lisp/org/org-bibtex.el (org-bibtex-get, org-bibtex-ask, org-bibtex)
(org-bibtex-check):
* lisp/org/ob-tangle.el (org-babel-tangle, org-babel-spec-to-string)
(org-babel-tangle-single-block, org-babel-tangle-comment-links):
* ob-table.el (sbe):
* lisp/org/ob-sqlite.el (org-babel-sqlite-expand-vars):
* lisp/org/ob-sql.el (org-babel-sql-expand-vars):
* lisp/org/ob-shen.el (org-babel-execute:shen):
* lisp/org/ob-sh.el (org-babel-execute:sh, org-babel-sh-evaluate):
* lisp/org/ob-scala.el (org-babel-scala-evaluate):
* lisp/org/ob-ruby.el (org-babel-ruby-table-or-string)
(org-babel-ruby-evaluate):
* ob-python.el (org-babel-python-table-or-string)
(org-babel-python-evaluate-external-process)
(org-babel-python-evaluate-session):
* lisp/org/ob-picolisp.el (org-babel-execute:picolisp):
* lisp/org/ob-perl.el (org-babel-perl-evaluate):
* lisp/org/ob-maxima.el (org-babel-execute:maxima):
* lisp/org/ob-lisp.el (org-babel-execute:lisp):
* lisp/org/ob-java.el (org-babel-execute:java):
* lisp/org/ob-io.el (org-babel-io-evaluate):
* ob-haskell.el (org-babel-execute:haskell):
* lisp/org/ob-fortran.el (org-babel-execute:fortran):
* ob-exp.el (org-babel-exp-code):
* lisp/org/ob-emacs-lisp.el (org-babel-execute:emacs-lisp):
* lisp/org/ob-ditaa.el (org-babel-execute:ditaa):
* ob-core.el (org-babel-execute-src-block, org-babel-sha1-hash)
(org-babel-parse-header-arguments, org-babel-reassemble-table)
(org-babel-goto-src-block-head, org-babel-mark-block)
(org-babel-expand-noweb-references, org-babel-script-escape)
(org-babel-process-file-name):
* lisp/org/ob-clojure.el (org-babel-execute:clojure):
* ob-calc.el (org-babel-execute:calc):
* lisp/org/ob-awk.el (org-babel-execute:awk):
* ob-abc.el (org-babel-execute:abc):
* ob-R.el (org-babel-expand-body:R):
* lisp/org/ob-C.el (org-babel-C-execute): Avoid deprecated ((lambda) ...).