Swap uses of _SERVER[DOCUMENT_ROOT] for __DIR__

4/4 - Update releases directory.

Remove unused Git attributes ident

The $Id$ keywords were used in Subversion where they can be substituted
with filename, last revision number change, last changed date, and last
use

Remove unused Git attributes ident

The $Id$ keywords were used in Subversion where they can be substituted
with filename, last revision number change, last changed date, and last
user who changed it.

In Git this functionality is different and can be done with Git attribute
ident. These need to be defined manually for each file in the
.gitattributes file and are afterwards replaced with 40-character
hexadecimal blob object name which is based only on the particular file
contents.

This patch simplifies handling of $Id$ keywords by removing them since
they are not used anymore.

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Link to the new 5.5 features that were just added.

Update the 5.5.0 news entry and release page.

Specifically:

- Linked to the relevant manual pages for all documented new features, rather
than RFCs or just having bare list it

Update the 5.5.0 news entry and release page.

Specifically:

- Linked to the relevant manual pages for all documented new features, rather
than RFCs or just having bare list items.

- Linked to php.net rather than www.php.net, per the canonical URIs.

- Made the punctuation consistent.

- Fixed up grammar.

There'll be another commit coming later tonight linking to the documentation
for the couple of items that didn't have documentation prior to 5.5.0 final;
that's waiting on a documentation build to finish and be pushed out.

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Removed another Wiki link: this one won't link directly to the right section
until the next docs rebuild, but it's at least linking to the right page.

Remove a couple of direct Wiki links and point to the manual instead.

Fixes for 5.5.0 announcement

5.5.0 final release