dpscanon flycircuit data release

A canned version of the flycircuit neurons in dotprops format as a single zip file. Use this together with load_si_data as a faster alternative to downloading all neurons one by one.

library(flycircuit)
dpscanon=flycircuit::load_si_data('dpscanon.rds')
datadir=attr(dpscanon, 'db')@dir
# this should look something like 
# [1] "/Users/jefferis/Library/Application Support/rpkg-flycircuit/data/data"
datadir
# unzip neurons to that folder
unzip(zipfile = 'dpscanon-datadir.zip', exdir = datadir, overwrite = F)