Extend optional fields for neurons:

[matentzn]

• [ ] "template"
• [ ] "filename" - name of file
• [ ] "Imaging type" (required) -> String (options = FBbi terms - confocal, EM etc - validate against KB)
• [ ] "Driver line" (optional) -> String (FlyBase ID - validate against FB & add to KB if not present)
• [ ] "neuron_type" Optional (default = FBbt:neuron) -> list of strings (check all are known FBbt IDs (Known neurons?)
• [ ] "neuropils: -> list of strings (check all are known FBbt IDs (Known neuropils?)
• [ ] "input neuropils": -> list of strings (check all are known FBbt IDs (Known neuropils?)
• [ ] "output neuropils" -> list of strings (check all are known FBbt IDs (Known neuropils?)