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?)