Fixed the way of opening a preference dialog.

That chrome URI has been changed in S3. Download Statusbar 2.01.
In conjunction with that change, it does not open a preference in new tab but in dialog.
Added "toggle auto mode" extension.

It has been added in S3. Download Statusbar 1.12.
Added "checksum this file" option.

It has been added in S3. Download Statusbar 1.11.
Added "checksum for any file" extension.

It has been added in S3. Download Statusbar 1.16.
Updated "s3dlbsnail" to version 0.0.3.