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).

This class tries to satisfy the following requirements:

  * all ASCII alphanumeric chars in the input should stay the same
    ASCII alphanumeric chars in the output
  * the resulting string should be as short as possible
  * the operation needs to be reversable without any data loss
  * the resulting ASCII string should be case insensitive
  * there should be no restriction on the input length
  * the whole UTF-8 range should be allowed

using it creates a way to store UTF-8 in filenames even if the
underlying filesystem does not support UTF-8. It is also pretty
robust when files are moved between various filesystems and it
creates shorter filenames than the currently used urlencoding.

The replacements (@...@) were partially translated and had spaces in
between. Please don't translate the text between @...@.

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.

	This patch adds support to include plugin tests in the
	DokuWiki testsuite. Plugin tests are located in a dedicated
	directory _test/within a plugin directory. The naming
	convention of the test files follows the one used in
	DokuWikis testsuite.

		<plugin>/_test/*.test.php 	-> single test
		<plugin>/_test/*.group.php  -> group test

	The plugin tests are accessible via the web interface
	of the test suite and via the cli interface. It is recommend
	to bundle plugin test in a plugin group test. The webinterface
	also allows to run all plugin tests at once.

	Test files must include:

		<dokuwiki>/_test/lib/unittest.php

	Example Test:

	require_once(DOKU_INC.'_test/lib/unittest.php');
	class plugin_test extends Doku_UnitTestCase {
		function test() {
			$this->assertEqual(1,1);
		}
	}

	Example Group Test:

	require_once(DOKU_INC.'_test/lib/unittest.php');
	class plugin_group_test extends Doku_GroupTest {
		function group_test() {
			$dir = dirname(__FILE__).'/';
			$this->GroupTest('plugin_grouptest');
			$this->addTestFile($dir . 'plugin.test1.php');
			$this->addTestFile($dir . 'plugin.test2.php');
			$this->addTestFile($dir . 'plugin.test3.php');
		}
	}

	At the moment unittest.php contains only two
	meta classes so plugins tests don't have to inherit
	from the simpletest classes.

	This patch should be treated as intermediate step to
	allow for plugin tests. The testsuite wasn't designed
	to include plugin tests. It should probably be refactored
	at a later point.