install more packages
Add mirroring registration

* calculated by James Manton from
  total-average-SV2-8-bit.nrrd
fix: need to find x position of neuron start points
save dotprops
script to mask neurons

* and mask data
all by all nblast of masked neurons
Merge branch 'ajdm-fish'

* ajdm-fish:
  all by all nblast of masked neurons
  script to mask neurons
  save dotprops
  fix: need to find x position of neuron start points
  Add mirroring registration
  install more packages
  Add plot of dendrogram in the style of one from original paper
  Add nat.nblast loading to setup script
  Add script to generate NBLAST scores for neurons
  Add script to mirror neurons
  Fix bug and add saving of neurons