Make Bulk Data excluded from Metadata configurable

[gunterze]

Configurable by Bulk Data Descriptor Attributes

Name	Type	Description (LDAP Attribute)
Bulk Data Descriptor ID	string	Bulk Data Descriptor ID (dcmBulkDataDescriptorID)
Exclude Defaults	boolean	Indicates if Attributes specified by the Composite Instance Retrieve Without Bulk Data Service Class shall be implicitly treated as Bulk Data (=false) or not (=true). (dcmBulkDataExcludeDefaults)
Attribute Selector(s)	string	Specifies individual Attributes treated as Bulk Data by XPath (e.g. DicomAttribute[@tag=”54000100”]/Item/DicomAttribute[@tag=”54001010”] ). (dcmAttributeSelector)
VR Length Threshold(s)	string	Specifies to treat all Attributes with a particular Value Representation (VR) which value length exceeds the specified threshold as Bulk Date. Format: =. (dcmBulkDataVRLengthThreshold)

referenced by Archive Device or Archive Network AE attribute :

Name	Type	Description (LDAP Attribute)
Bulk Data Descriptor ID	string	ID of Bulk Data Descriptor applied by all services providing Metadata of archived instances. If absent, only Attributes specified by the Composite Instance Retrieve Without Bulk Data Service Class are treated as Bulk Data. (dcmBulkDataDescriptorID)

Bulk Data Descriptor provided by default Configuration:

Attribute	Value
Bulk Data Descriptor ID	default
Exclude Defaults	false
Attribute Selector(s)	none
VR Length Threshold(s)	DS,FD,FL,IS,LT,OB,OD,OF,OL,OW,UC,UN,UR,UT=1024

Improves #276