Doc fixes. Changes for compiler warnings.

Doc fixes.  Changes for compiler warnings.
(syntax): Don't require.
(python) <defgroup>: Add :version.
(python-quote-syntax): Re-written.
(inferior-python-mode): Move stuff here from run-python and add
some more.
(python-preoutput-continuation, python-preoutput-result)
(python-dotty-syntax-table): New.
(python-describe-symbol): Use them.
(run-python): Move stuff to inferior-python-mode.  Modify code
loaded into Python.
(python-send-region): Use python-proc, python-send-string.
(python-send-string): Send newlines too.  Callers changed.
(python-load-file): Re-written.
(python-eldoc-function): New.
(info-look): Don't require.
(python-after-info-look): New.  A modified version of former
top-level code for use with eval-after-load.
(python-maybe-jython, python-guess-indent): Use widened buffer.
(python-fill-paragraph): Re-written.
(python-mode): Fix outline-regexp.  Set outline-heading-end-regexp,
eldoc-print-current-symbol-info-function.  Add to eldoc-mode-hook.