Extend MWL SCP to return matching MWL items ordered by specified attributes

[gunterze]

Extend MWL SCP to return matching MWL items ordered by MWL item attributes specified in Sorting Operations Sequence (0072,0600) in the MWL C-FIND request Identifier:

Attribute Name	Tag	Description
Sorting Operations Sequence	(0072,0600)
>Selector Attribute	(0072,0026)	Data Element Tag of an Attribute from the MWL item used for sorting - may specify an attribute in the root data set or nested in the item of Scheduled Procedure Step Sequence (0040,0100) listed below.
>Sorting Direction	(0072,0604)	Sorting direction. Enumerated Values: INCREASING, DECREASING

Support order by MWL item attributes :

Attribute Name	Tag
Scheduled Procedure Step Sequence	(0040,0100)
>Modality	(0008,0060)
>Scheduled Procedure Step Start Date	(0040,0002)
>Scheduled Procedure Step Start Time	(0040,0003)
>Scheduled Performing Physician's Name	(0040,0006)
>Scheduled Procedure Step ID	(0040,0009)
Accession Number	(0008,0050)
Study Instance UID	(0020,000D)
Requested Procedure ID	(0040,1001)

Related #1178