(forms-mode): Plug security hole by disabling `eval-buffer' unless

(forms-mode): Plug security hole by disabling `eval-buffer' unless
`enable-local-eval' is set to t.
Correct setting of `forms--mode-setup'.
(forms--local-write-file-function): New function to be used as
`local-write-file-hooks'.
(forms-mode): Use it.
(forms-find-file,forms-find-file-other-window): Locally set
`enable-local-eval' and `enable-local-variables' to t.
(forms-find-file-other-window): Remove extraneous call to
`eval-current-buffer'.