Release 2015.1.21

Contributors: Albert Cardona, Andrew Champion, Tom Kazimiers

Features and enhancements

General neuron tracing:

• A new radius editing option has been added that propagates from the current
  node root-ward to the previous node with an undefined radius (exclusive).
  Here undefined is taken to be a negative radius, since though the column
  default is 0 Django initializes it to -1.

Miscellaneous:

• Users need now to confirm the closing of the last stack.

Bug fixes

Tracing overlay:

• A label is now hidden when the mouse hovers over it. Note that this only works
  for one label at a time, so it is not effective for overlapping labels. A
  robust solution would require more expensive event propagation over label
  elements.
• Fullscreen on OS X Safari should now work, too.
• Nodes and arrows are now drawn in order: lines, arrows, nodes, labels
• Fix bug that could occur during radius propagation when the previous node
  already had a radius defined.
• Fix mouse handlers of node and error drawing, which were broken by adding
  ordered drawing.

Synapse clustering:

• A long-standing error has been fixed where a few nodes where added to an
  undefined cluster.

Group graph:

• The root node computation has been fixed.
• Listing edge synapses now also works with split grouped neurons.

3D viewer:

• Make synapse clustering fetch synapses properly (like it is done in the Group
  Graph).