cperl-mode: how to turn off autoinsertion of everything?

[David Storrs]

I'm using GNU Emacs 24.5.1 on OSX 10.11.3.  I recently upgraded emacs from
v22 and now cperl-mode is behaving differently -- it's "helpfully"
inserting things like braces and newlines when it thinks it should.  I
would like to make it stop doing this -- I don't want it modifying my text
at all.  Don't insert braces, newlines, anything.

After a surprising amount of googling I figured out how to turn off
everything except the newline insertion, but now I'm stumped.  How do I
tell emacs "Don't mess with my source -- if I want something there I'll
type it"?

Pointers to an appropriate section of the FM welcome, as I haven't been
able to find anything relevant.

Dave