jefferis/elmr: elmr package v0.5.5

elmr 0.5.5

• teach open_fafb to make many URLs at once e.g. for results of tagged_details (#41)

• add plot3d.ngraph (shows directed graph in 3d)
• fix simplify_neuron when spine has 1 branch only (#40)
• vignette tweaks

• teach simplify_neuron to handle the inverse as well (#38)
• change IVLP -> WED in FAFBNP surfaces as well as FAFB14NP (#35)
• teach fetchn_fafb to work even if FAFB is given as the reference brain (#39)