tweaking
added data on auditory system and the "complex" attribute
add data on somatosensation
renamed "cns.ls" to "cns.basal"

for the lack of a better term that describes the interior of the
cerebral cortex
more data
remove "group" attribute from cranial nerves

that way these unrelated nerves don't get bundled together by neato
added data on hippocampus and sensory fibers
tweaking