Fixed SMB rename function to overwrite target file

Add a (currently) empty system for running common repair steps

remove passwords from logfile

check if user is logged in

Fixed various Dropbox issues + unit tests

Return true when touch succeeds

- coverage for touch return value
- fixed directory provider to exclude unsupported cases

- fixed touch function to return true on success
- fixed local metadata cache to remove deleted files/directories
- fixed getMetaData() to ignore files reported as deleted by
  Dropbox
- fixed "file not found" case to not log as exception
- fixed "overwrite on rename" case
- fixed unit tests to exclude unsupported cases
- added unit test for touch return value
- unit tests for Dropbox should all run correctly now

use oc filesystem operations to calc the versions size

Fixed FTP storage unit tests to use the correct class

Add "single user mode"

Fix api documentation

add occ commands for enabling and disabling apps

Now using a different content to make sure the file was overwritten.

Also fixed "rename" unit test that was ready the result out of the wrong
file.

Fixing rawpath reverseproxy oc6

adding chunked upload handling

Fix navbar issue

fixes #6024

provide more cli friendly error messages when in cli mode

This can be enabled by setting 'singleuser' to true in config.php