babel: New function to process file names for use in external processes

babel: New function to process file names for use in external processes

	* ob.el (org-babel-process-file-name): New function
	(org-babel-maybe-remote-file): Delete function

	* ob-sql.el (org-babel-execute:sql):
	Use org-babel-process-file-name

	* ob-scheme.el (org-babel-execute:scheme):
	Use org-babel-process-file-name

	* ob-sass.el (org-babel-execute:sass):
	Use org-babel-process-file-name

	* ob-ruby.el (org-babel-ruby-evaluate):
	Use org-babel-process-file-name

	* ob-python.el (org-babel-python-evaluate-external-process):
	Use org-babel-process-file-name
	(org-babel-python-evaluate-session):
	Use org-babel-process-file-name

	* ob-plantuml.el (org-babel-execute:plantuml):
	Use org-babel-process-file-name

	* ob-perl.el (org-babel-perl-evaluate):
	Use org-babel-process-file-name

	* ob-octave.el (org-babel-octave-evaluate-external-process):
	Use org-babel-process-file-name
	(org-babel-octave-evaluate-session):
	Use org-babel-process-file-name,
	don't use org-babel-maybe-remote-file

	* ob-lisp.el (org-babel-execute:lisp):
	Use org-babel-process-file-name

	* ob-ledger.el (org-babel-execute:ledger):
	Use org-babel-process-file-name

	* ob-js.el (org-babel-execute:js):
	Use org-babel-process-file-name

	* ob-haskell.el (org-babel-haskell-export-to-lhs):
	Use org-babel-process-file-name

	* ob-gnuplot.el (org-babel-execute:gnuplot):
	Use org-babel-process-file-name

	* ob-eval.el (org-babel-eval-read-file): Don't use
	org-babel-maybe-remote-file

	* ob-dot.el (org-babel-execute:dot):
	Use org-babel-process-file-name

	* ob-ditaa.el (org-babel-execute:ditaa):
	Use org-babel-process-file-name

	* ob-clojure.el (org-babel-clojure-evaluate-external-process):
	Use org-babel-process-file-name

	* ob-asymptote.el (org-babel-execute:asymptote):
	Use org-babel-process-file-name

	* ob-R.el (org-babel-R-assign-elisp): Don't use
	org-babel-maybe-remote-file, use org-babel-process-file-name
	(org-babel-R-evaluate-external-process):
	Use org-babel-process-file-name
	(org-babel-R-evaluate-session):
	Use org-babel-process-file-name

	* ob-C.el (org-babel-C-execute):
	Use org-babel-process-file-name

In addition to passing the file path through `expand-file-name',
tramp-style remote file names are converted to conventional (local)
file paths. The reason is that, if a tramp file name was in use in
emacs, then the shell command will be executing on the remote machine
in question. Further, by default the file name is passed through
`shell-quote-argument'.