nat: nat 1.7.0

CRAN release

• implement extraction/replacement of the data.frame attached to a neuronlist using the [ operator (#217)
• fix xform of image data (#143, #199)
• implement handling of inverted (swapped i.e. reference to sample) registrations in xform(image) (#199)
• normalise handling of registration sequences and inversion in xform/image/points (all 3 expect reg to be in sample to ref order and for any individual registration to be marked with swap=T if it is ref->sample)
• read.nrrd no longer returns an im3d (use read.im3d) (#238)
• teach write.nrrd to handle more diverse inputs (including #242)
• add reading of detached nrrds (#236, #237)
• add ability to write detached nrrds
• add ability to make a detached nrrd from a compatible amira file on disk (#243)
• new function is.im3d
• fix cmtk.targetvolume for templatebrain objects (#241)
• fix cmtk.targetvolume for --target-grid specification (#240)
• fix names for [.neuronlistfh with null df (#250)
• plot.neuron can cope with some NA coordinates
• teach plot.neuron(list) to cope with NA points (#247)
• boundingbox has an na.rm argument (#246)
• teach droplevels.neuronlist to use extra arg (#249)
• teach plot.neuron to plot soma (#245)
• fix cmtk.call for numeric args (#235)
• set read.hxsurf RegionChoice="both" by default
• document return values of cmtk.statistics in more detail (#252)
• support for igraph 1.0 (#248)