Don't patch perlopentut: rewrite it completely

Patch made by rjbs, from <10107.1361064602@chthon>

> Nearly [all of perlopentut] is non-simple. That is not a tutorial,
> and it is not just about open.  It is more like "FMTEYEWTK About
> open() and I/O in Perl". If the goal is to create a document that
> teaches people how to use open() for the simple cases, then there
> is no hope for perlopentut.  It cannot be turned into that,
> because that is not what it is.  You have to start over.
perlopentut: correct perlfaq links

thanks to David Golden for pointing this out
perlopentut: add copyright/author, remove history
perlopentut: Spelling and stylistic improvements only.
perlopentut: standardize on no newline in die

it is nice to know from where an error originates!
Merge branch 'perlopentut' into blead
perldelta: note the perlopentut rewrite