Only one download package: combine update and new installation package

[Klap-in]

• When doing update here twice the wrong version is selected for performing the update (of course by kind of miscommunication).
• (because whole stuff is in software revision control system we don't lose anything, but i don't know how usual that is)
• It is bit contra-intuitive due to other plugins and dokuwiki itself don't work with a dual packages.

Therefore my proposal:

• Please create only one download package.
• Rename all the example files in the conf/ folder to something like: conf/boxes.php.dist

In this way:

• you can update the *.dist files when you like,
• have users always a clean example
• there is never the possibility to overwrite user created stuff at update.