nat 1.8.8

add xyzmatrix<-.neuronlist so that we can replace the vertices of a set of
objects in one go (#328)
add as.mesh3d.ashape3d thereby adding support for 3D alpha surfaces generated
by the alphashape3d package (#337)
add as.hxsurf to convert surfaces (#332)
add nvertices as generic method to find the number of vertices in an object
(#329)
add plot3d.cmtkreg to visualise domain of CMTK registration (#333)
speed up resample function (and seglist2swc) (#336)
add an option to override default progress bar behaviour for nlapply (and many
other functions that use it) (#322)
make plot3d more forgiving of colour specification (#331)
fix overwrite=T option for landmarks files (#319)
fix prune_edges for paths with opposing edge directions (#320)
make read.amiramesh cope with different NA values (#324)
fix crashing bug in read.neuron.hxlineset for malformed files (#325)
only warn if xform.neuronlist fails to transform soma positions (#326)

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