Support deletion of objects archived in TAR files

[gunterze]

Support deletion of objects archived in TAR files

• initializing Location property

    @Column(name = "multi_ref", updatable = true)
    private Integer multiReference;
  

  referring objects archived in TAR files with the hash code of the tar file path

• Delete TAR file on permanent deletion of last object in TAR file

• persist this property in Series Metadata in Private Attribute

  Name	Tag	VR
  Storage Object Multi-Reference	(7777,xx57)	IS

• initialize that property from Series Meta Data on restore of purged instance/location records

Related #3656