Enhancement: Enable `blank_line_after_opening_tag` fixer (#875)

Enhancement: Enable `void_return` fixer (#661)

* Enhancement: Enable void_return fixer

* Fix: Run 'make coding-standards'

Enhancement: Include `*.inc` files (with exceptions)

Closes GH-662.

Changelog: do not confuse GH-xxx with #xxx bugs

Closes GH-619.

Add minor links to sidebar and unify rendering (changelog)

Add sidebar to ChangeLog rendering for navigating between versions

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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added feature request and github issues link functions

Use release_date() also in PHP4 changelog