v0.7.0-alpha EAST PENTIRE

• Very many more unit tests
• Bug fixes
• Complete rewrite of spectrum system, using the SpectrumSet object
• Multidot now does painted regions and floodfill
• Joseph's PCT detector outputs image with ROIs
• Dump removed and sink enhanced
• TabData shows sources
• Inputs decoupled from Sources - Sources now use composition, not inheritance
• Comment box for nodes removed (it was never used)
• Direct multifile loading
• Direct PDS4 loading - required refactoring of entire PDS4 layer
• Direct ENVI loading
• Raw file loading from mono images supporting lots of formats
• Loader presets for multifile
• Operator overloading on Datum objects
• The "datumfunc" system replacing hand-registration of functions
• flip and rotate functions (datumfuncs)
• String datum objects and strings usable in expr
• Docs on library usage
• Changes to nodes so that slow nodes can be disabled and very slow nodes start disabled. This
  functionality existed before, but was "ad-hoc"
• Document.changed() is now Document.run() and forces disabled nodes to run
• Most nodes now store data in their outputs rather than a "node.out" which is then written to
  an output
• Changes to multidot - doc improvements, UX and bug fixes