add example for ReconFilterType is 'none'

pet006/README

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+This dataset consists of a single calibration scan done on a Phantom, it's primary use is to ensure the behavior defined by the BIDS Speficication wrt to
+If ReconMethodParameters = ['none']; then ReconFilterSize is optional and ReconMethodParameterLabels = ['none'] are valid. 

pet006/dataset_description.json

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+{"BIDSVersion":"1.9.0",
+    "License":"CCO license",
+    "Name":"BIDS Example Dataset PET 006",
+    "Authors":["Murat Bilgel", "Cyril Pernet", "Anthony Galassi"],
+    "Acknowledgements":"John Hopkins University PET team for scanning this phantom.",
+    "Funding":["Not Sure"],
+    "DatasetDOI":""}

pet006/participants.json

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+{
+  "participant_id":{
+    "LongName":"Participant Id",
+    "Description":"label identifying a particular subject"
+  },
+  "weight":{
+    "LongName":"Weight"
+  }
+}

pet006/participants.tsv

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+participant_id	weight
+sub-01	4

pet006/sub-01/pet/sub-01_pet.json

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+{
+	"AcquisitionMode": "list mode",
+	"AttenuationCorrection": "measured(emission present), 0.096000 cm-1, attenuation smooth",
+	"AttenuationCorrectionMethod": "measured(emission present), 0.096000 cm-1, attenuation smooth",
+	"BodyPart": "Phantom",
+	"DecayCorrectionFactor": [1.42614],
+	"DoseCalibrationFactor": 1323,
+	"FrameDuration": [98000],
+	"FrameTimesStart": [0],
+	"ImageDecayCorrected": true,
+	"ImageDecayCorrectionTime": 0,
+	"InjectedMass": 181149988.3691438,
+	"InjectedMassUnits": "ug",
+	"InjectedRadioactivity": 75.84999999999999,
+	"InjectedRadioactivityUnits": "MBq",
+	"InjectedVolume": 0,
+	"InjectionStart": 0,
+	"InstitutionName": "NIH Clinical Center, USA",
+	"Manufacturer": "GE MEDICAL SYSTEMS",
+	"ManufacturersModelName": "GE Advance",
+	"ModeOfAdministration": "infusion",
+	"ReconFilterSize": [0],
+	"ReconFilterType": "None",
+	"ReconMethodName": "3D Kinahan - Rogers",
+	"ReconMethodParameterLabels": [
+	  "none"
+	],
+	"ReconParameterUnits": "none",
+	"ScanStart": 0,
+	"ScatterCorrectionMethod": "Gaussian Fit",
+	"SpecificRadioactivity": 418713.8,
+	"SpecificRadioactivityUnits": "Bq/g",
+	"TimeZero": "12:44:31",
+	"TracerName": "FDG",
+	"TracerRadionuclide": "F18",
+	"Units": "Bq/mL",
+	"filename": "D:\\BIDS\\ONP\\OpenNeuroPET-Phantoms\\sub-GeneralElectricAdvanceJHU\\pet\\sub-GeneralElectricAdvanceJHU_pet.json"
+  }

pet006/sub-01/pet/sub-01_pet.nii.gz

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+