Add CT-SEG to Datagraph

[uyousafzai54]

Added code to datagraph.py to create edge_type 7 (SEG -> CT) and added support to query them. Currently working on allowing SEGs to be converted to NIFTIs.

Needs manual testing before automated tests are added.

[uyousafzai54]

Manual testing seems to work (dataset.csv generated file shown below). Will determine if an automated test can be added.

[uyousafzai54]

FIELD1	study	patient_ID	series_CT	input_folder_CT	series_SEG_CT	input_folder_SEG_CT	DataCollectionDiameter	SliceThickness	PatientPosition	Manufacturer	ScanOptions	RescaleType	RescaleSlope	ManufacturerModelName	PixelSize	KVP	XRayTubeCurrent	ReconstructionDiameter	ConvolutionKernel	size_CT	output_folder_CT	output_folder_SEG_CT	Modalities	numRTSTRUCTs
0_R01-004	1.3.6.1.4.1.14519.5.2.1.4334.1501.208187082474832682405271850372	R01-004	1.3.6.1.4.1.14519.5.2.1.4334.1501.891418286389326370663529028512	NSCLC Radiogenomics/R01-004/09-09-1991-NA-CT CHEST WO-50372/4.000000-THIN LUNG WINDOW-28512	1.3.6.1.4.1.14519.5.2.1.4334.1501.120630046496246362953027314916	NSCLC Radiogenomics/R01-004/09-09-1991-NA-CT CHEST WO-50372/1000.000000-3D Slicer segmentation result-14916	500.0	1.25	FFS	GE MEDICAL SYSTEMS	HELICAL MODE	HU	1.0	Discovery CT750 HD	('0.828125', '0.828125', '1.25')	120.0	610.0	424.0	LUNG	(424, 424, 276)	0_R01-004/CT	0_R01-004/SEG_CT	['CT', 'SEG']	0.0