Mastodon improvements

[xulman]

As of the commit 897129af6ada206cbc3ece847801214169698d9e, that is v1.4.0, there exists Mette branch, in which some future Mastodon plugins are being developed. Here's a TODO list for them:

• GUI for yEd exporter
  • export complete graph or just selected nodes
  • export the tree as such or time2gen decimated tree
  • allow to adjust x- and y-axis stretch
  • allow to adjust size of the nodes (these are merely a layout params, other visuals would be left for the yEd)
  • ask for output filenames
  • checkbox if the current color scheme should be followed into the output
  • choice box to "just export", "export also layout hints", "consider external layout hints"
  • edge style - straight (as in Mastodon) or bended
• join with Manan's plugin (outlook on the time2gen decimated tree)
  • to replace the GraphStreamer option

[xulman]

• exported labels should be the labels of the mother, not of the first node of a cell's cycle
• checkbox if the very first node should be displayed (this is the one that gives name to the whole tree, e.g. "3A") - if enabled, the first cell cycle would may be represented with two nodes (the first node (always) and mother (if available))

[xulman]

also add: CellTrackingChallenge/CTC-FijiPlugins@2a7ed5a