While making myself comfortable and following the walk through I found some errors:
Chapter 4.1:
The name of the class file is "MantisPlugin.class.php", not "MantisPlugin.php".
Chapter 4.2.2:
The name of the page file is "plugin.php", not "plugin_page.php".
Chapter 4.2.5 and 4.3.4, file "Example/pages/config_page.php":
In "<td class="form-title" rowspan="2">" the "rowspan" should be a "colspan".
Chapter 4.2.5 and 4.3.4, file "Example/pages/config_page.php", and 2 times:
At "<td class="category">" there is "<php" which should be "<?php".
Chapter 4.2.3 and 4.3.6, file "Example/page/foo.php":
Compared with the first version of the file in chapter 4.2.2 an "echo" was lost in line 3. Or the semicolon at the end of line 2 should be a comma.
Anyway, thanks for the concise and helpful guide! | 
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