This patch adds an option to choose how filenames are encoded
when saved to the file system. You can choose between urlencoding
(url), the new SafeFn method (safe) and storing real UTF-8 (utf-8).

There are two new parameters submitted that contain the currently
selected namespace and page id so it can be selected again
indenpendently from the opened namespace.

Previously the content of expanded namespaces was displayed below
all other pages, now it is placed below it's parent namespace.
The new comparison function is quite complex. Please have a look at it
if it can done easier or if there are cases I haven't considered where
the function produces incorrect results.

This introduces a new function called tpl_flush() which should be used
by template authors in favor of the PHP flush() method.

Plugins may return false in isSingleton to let plugin_load return a new
instance every time it is called.
Renderer plugins are not loaded with $new set to true, but instead specify
themself that they are not singletons. This behaviour allows the odt renderer
to keep working (see #1598).

* Popup now shows up relative to the link, not the mouse position
* Easier handling of mouseout’s bubbling
* Factor out popup creation to allow plugins to use it

Each searches on the wiki use this function. Scanning the index directory eachtime is time consuming with a constant series of disk access.
Switching a normal search to use file_exists 1 or more times, and not readdir all the directory.
Switching a wildcard search to use a lengths.idx file containing all the word lengths used in the wiki, file generated if a new configuration parameter $conf[readdircache] is not 0 and fixed to a time in second. Creation of a new function idx_listIndexLengths to do this part.

Before this patch the temporary filename was the uncleaned id. This
allowed everyone with upload-privileges (on the whole wiki) and XML-RPC
privileges on a XML-RPC-enabled DokuWiki to (over)write any file PHP is
allowed to write with any content he wants. If you have XML-RPC enabled
and users with XML-RPC and upload privileges you don't trust in a way
you would allow them to write any file PHP may write, consider this as
an important security fix. By default XML-RPC is disabled, so if you
don't know what I'm talking about you are probably not affected by the
problem.