Add support for copying/moving folders between storages, move isIgnoredDir() to Filesystem
Add tests for copying/moving between storages
Fix undefined variable for copying empty folders
Add data-dir attribute to home breadcrumb
Remove user name addition to paths in deleteAll
Switch to calling deleteAll via storage to avoid emitting delete hook
Merge branch 'master' into move-storages

Conflicts:
	tests/lib/files/view.php
Merge pull request #3425 from owncloud/move-storages

Support for moving/copying folders between storages