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When point is at beginning-of-defun, end-of-defun moves to the end of
the defun, even if it contains nested defuns. When point is at any
inner defun end-of-defun moves to the end of it, if another inner
defun exists at the same level point is moved to it.

For beginning-of-defun things are funkier, it would move backwards
following nested defuns in order. This will be fixed soon.

Note: Decorators are considered part of defuns.

Removed:
    * python-use-beginning-of-innermost-defun
    * python-beginning-of-innermost-defun-regexp

Renamed:
    * python-beginning-of-defun => python-nav-beginning-of-defun
    * python-beginning-of-defun-regexp => python-nav-beginning-of-defun-regexp