[#LIB-141 add module dcm4che-ws-rs]

added png media type
[#LIB-233 Configuration for dcmImageWriteMetadata]

Schema change: added attribute dcmWriteIIOMetadata and added it to class
dcmImageWriter
made appropriate changes for storing, loading and modifying new
configuration
 [#LIB-233 Configuration for dcmImageWriteMetadata]