Autoload all commands from misc.el

Autoload all commands from misc.el

Only two of the commands there were autoloaded, one of which is an
easter egg.
* lisp/miscl.el (copy-from-above-command):
* lisp/miscl.el (zap-up-to-char):
* lisp/miscl.el (mark-beginning-of-buffer):
* lisp/miscl.el (mark-end-of-buffer):
* lisp/miscl.el (upcase-char):
* lisp/miscl.el (forward-to-word):
* lisp/miscl.el (backward-to-word):
Add autoload cookie.