C-x C-w should be hip to current file permissions

[Dan Jacobson <jidanni@dman.ddts.net>]

I edited an existing shell script [mode 744] and used C-x C-w to write
it into a new file.  I notice that that files modes were just my plain
umask modes and I had to take the time to make it executable.

And what if I had been editing a 600 file, would a C-x C-w version
become 644 spilling my beans?

Info says: `C-x C-w' (`write-file').  It is precisely
equivalent to `set-visited-file-name' followed by `C-x C-s'.  `C-x C-s'
used on a buffer that is not visiting a file has the same effect as
`C-x C-w'; that is, it reads a file name, marks the buffer as visiting
that file, and saves it there.

So there's more to consider.  Anyway C-h k C-x C-w should give a clear
statement about what happens to permissions, and so should Info.
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