Include etags for the root of the shared folder
Include etag field for folder contents
Fix WebDAV uploading of partial shared files
Return unknown free space for shared root folder so we can still upload partial files
Fix variable
Correct parent folders' ETags for all users with access to a shared file
Fix target path and reuse mtime
Merge branch 'master' into shared-folder-etags

Conflicts:
	apps/files_sharing/lib/sharedstorage.php
Update ETag when file is shared
Fix variable name in Shared_Updater
Fix group post_shared hook
Merge branch 'master' into shared-folder-etags

Conflicts:
	apps/files_sharing/appinfo/app.php
Move hook connectors from shared storage to app.php, add post_unshare hook
Preserve Debug flag accross config writes
Update Shared folders ETags of users with reshares
itemSource parameter should be fileSource
Merge branch 'master' into shared-folder-etags

Conflicts:
	apps/files_sharing/lib/sharedstorage.php
Fix #2080 and fix #2141
remove php_value

php_value can only be used with mod_php, using it with FCGI will cause 500 Internal Server errors.  This needs to be set in php.ini manually or set using ini_set().
use pre_unshare hook, otherwise the share is already removed. Which means that we have no chance to determine which folder has to be updated