Add new neurons (and update existing ones) in the aedes_main flytable
Source:R/aedes_add_neurons.R
aedes_add_neurons.RdBrings the supplied ids to the current segmentation timestamp,
reads the aedes_main table fresh, and pins both sides to the same
timestamp via aedes_sequential_update() so that join-by-root_id is
reliable. Rows whose root_id is already present are updated with any
extra columns supplied via ...; rows that are absent are appended with a
point_xyz computed by aedes_key_point(). supervoxel_id and
serial_id are left blank — a server-side process fills them in from
point_xyz.