Deleting all files in trash now only sends a single flag

To prevent having to send the list of all files for deletion, only set a
flag "allfiles". This should make it a bit smoother when deleting 5000+
files.

Also fixes some "empty trash" message issues.
Fixed ext storage touch function to return true on success

Some ext storage impl didn't return true on success.

Fixes #5943 (Dropbox)
Fixes #6010 (WebDAV)
provide more cli friendly error messages
add occ commands for enabling and disabling apps
fix db.php doc
Merge pull request #6028 from owncloud/extstorage-touchoperationreturnvalue

Fixed ext storage touch function to return true on success
fix defaults.php doc
handle duplicate slashes in case of reverse proxy configuration
Merge pull request #5641 from owncloud/filestrash-emptytrash

Deleting all files in trash now only sends a single flag
fix defaults.php doc
in case uri and script name don't match we better throw an exception
adding chunked upload handling
Merge pull request #6030 from owncloud/cli-errors

provide more cli friendly error messages when in cli mode
AppFramework(Controller|HTTP|HTTP-Responses|Middleware), IContainer API fixes
page level doc blocks and class descriptions
fix some capital letters
Fix navbar issue

fixes #6024
Merge pull request #6040 from owncloud/fix-navbar-css

Fix navbar issue
Merge pull request #6037 from owncloud/fix-6007-oc6

adding chunked upload handling
Merge pull request #6035 from owncloud/fixing-rawpath-reverseproxy-oc6

Fixing rawpath reverseproxy oc6