Ginga v2.6.2

• Added some colormaps from ds9 that don't have equivalents in Ginga or matplotlib
• Fix for recognizing CompImage HDU type when using astropy.io.fits
• Add new experimental OpenGL back end
• Fixes for Tk back end on python 3
• You can now write separately distributed and installable plugins for the reference viewer that Ginga will find and load on startup
• Added --sep option to load command line files into separate channels
• New help screen feature available for plugins
• Lots of updates to documentation
• Fixed a stability issue with drag and dropping large number of files under Linux
• Fixes for python3 and several example programs
• Fix for interactive rotation bug under matplotlib back end