Prevent TEST calls with root-rights

Currently, very often tests on master fail because of some sort of problems with user data. There should be a possibility, to clean/renew the user-data folder (defined as APPLICATION_DATA) completely before renewing the database (what is done before a run of all tests). There are several problems & requirements to meet:

• APPLICATION_DATA may be set after the Database-recreation in the test-command (investigate). HINT: when using the virtual test-db, APPLICATION_DATA points to /testdata
• Code should become a base-class (e.g. ZfExtended/UserData.php)
• /locales folder inside APPLICATION_DATA must be stored elsewhere (/locales ?) until we have reworked the languages stuff
• If deletion fails due to non-deletable stuff (>owned by root) a precise exception must be thrown-
• .gitignore,  .htaccess, /visual/.htaccess must either be excepted from cleanup or recreated. Also, the .gitignore logic should be changed to use just one .gitignore in the folder
• /visual, /logs, /tmp, /cache, /backup must be added as empty folders OR
• there are accessor functions for those subfolders automatically creating them on use and used throughout the code (preferred solution)

After discussion with Thomas, the issue is simpler: We simply prevent test-calls with root-rights or users, that cannot read/write the /data directory