When accessing a shared folder, the folder's owner appears as mountpoint
but wasn't wrapped by a quota storage wrapper.

This fix makes sure that all home storages are wrapped by a quota
storage wrapper, if applicable, to make sure quotas are respected when
uploading into shared folders.

Since unlink() smb4php doesn't return true on deletion success, we need
to check whether the file was deleted to confirm success.

Fixes #5866

Fixes #4593

Added argument to getFileInfo() to disable adding the size of
mountpoints to a directory's size.

Fixes #5924

Now removing "/./" and trailing "/." from the paths when normalizing.

Legacy home storage ids with the format "local://path/to/datadir/user1"
are now also wrapped by the HomeStorage.

Added clearstatcache to make sure we get the correct file size after
re-writing into the same file.

This failed on openSUSE 12.3 x86_64

- Added missing return statement
- Added missing support for SEEK_END
- Fixes #5524

To avoid having to use OCP\Appframework\Http\Http in the public - and stable
- API OCP\Appframework\Http is now both a class and a namespace.

Callers of streamCopy() expect an array to be returned containing count and result.

otherwise the returned internalPath will not match followup calls to e.g. Cache::getID()