Now creating real users and groups for testing external storage mounts

Moved the mounting code for external storage from
OC\Filesystem::initMountPoint to files_external using the
post_initMountPoints hook

Added obfuscation for all "password" options from external storages.
Added unit tests for reading/writing the configuration.

Fix validation of allowed personal backend

Set overflow-y to auto

Fix smb4php to work with home shares

- test config was written correctly (global and local)
- test that personal mount points can be added for allowed backends
- test that personal mount points cannot be added for disallowed backends
- added $skipTest flag to make it possible add mount points without
  doing an actual check/connection (note: this is necessary because the
  static class OC_Mount_Config cannot be mocked)

Display admin option for public upload with encryption enabled

Now that public upload works with encryption, the admin option to toggle
it must be made visible.

Move routing classes to an interface and expose it in the public api

Stat'ing a share with url_stat now checks if the user can run 'ls' in that share rather than checking if the share is listed by the server. This means that OwnCloud can now mount user home shares, which are never listed by the server.

use a non-recursive chmod on the datadir

Correctly round bytes when converted from human readable format

clarify the use-case of the encryption app.

Added warning for trusted_domains after CLI upgrade

use preDelete instead of postDelete hook

make it possible to influence output type of \OC_Image

Instead of leave two decimal places which is confusing, round the byte
values correctly to the closest byte.

remove unneeded icon class

add 'body-public' ID to body in base layout so it can be identified via CSS

If trusted_domains is not set after a CLI upgrade, show a warning in the
output.