GNU sed maintainers, please document GNU sed's "-E" option (which is now in POSIX)

[David A. Wheeler]

Dear GNU sed maintainers, please accept the attached patch.

It modifies the sed documentation to note the sed "-E" option,
and also notes that POSIX has added "-E" to sed.
GNU sed already supported "-E" but didn't document it... so let's fix the
documentation!

Proof that "sed -E" has been accepted by POSIX is here:
    http://austingroupbugs.net/view.php?id=528

I believe this patch is not legally significant for copyright, per
"http://www.gnu.org/prep/maintain/html_node/Legally-Significant.html";.
These are trivial changes and reorg. Thus, I don't think this is
subject to copyright, and I believe no papers are needed.
I disclaim all copyright, etc.  I did NOT do this for my work, so no issue 
there either.

Thanks!

--- David A. Wheeler

0001-Modify-documentation-to-note-sed-E-option-now-in.patch
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