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Step 4 of `Getting it up and running` is not applicable in newer versions.

No more background folder for example. Also comments on chmod a+w

We're using the try-catch-finally clause where "finally" wasn't introduced
until PHP 5.5, so our minimum requirement for GNU social is bumped to that.

Internationalization support is required for transliteration, which is
currently used when creating the slugs for hashtags and such. It is a
much more stable and efficient solution than having an unmaintainable
list of unciode characters in an array...

lib/installer.php already said that when installing.

Apparently we had two installation instructions, one of which were incomplete.

Also added distribution specific notes.

The "XMLWriter" PECL extension is included by default since PHP 5.1.2

IE versions older than 8 (which these were for) should no longer
be used anyway, since they are filled with security holes and not
even Microsoft recommends or supports their use anymore.

Also we now recommend the mysqlnd driver, instead of 'mysql', so no need
to mention deprecation in daemon.php comments.

Conflicts:
	lib/framework.php