Swap uses of _SERVER[DOCUMENT_ROOT] for __DIR__

4/4 - Update releases directory.

Trim trailing whitespace

This patch cleans all redundant trailing whitespace across the
repository except for the icalendar files.

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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Kill off XHTML

Long live HTML5! =)

release page and link fixes:
- fix relative links to point to proper pages
- fix absolute links to point to local pages (in user language)
- iconv French pages to use utf8
- plug

release page and link fixes:
- fix relative links to point to proper pages
- fix absolute links to point to local pages (in user language)
- iconv French pages to use utf8
- plug in missing release announcement holes with news.php.net archives
- shorten existing news.php.net links

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utilize the releases folder instead of pseudofoldering with prefixing file names