Spectral Python 0.16.0

New Features

• Adaptive Coherence/Cosine Estimator (ACE) target detector
• Pixel Purity Index (PPI)
• Adjustable linear color stretches (based on data limits or cumulative histogram)
• Ability to save ENVI Classification files (thanks to @ohspite)
• ImageView class has set_title method

Changes

• imshow image displays use a linear 2% color stretch by default (can
  override this in spectral.settings)
• Limited Python 3 compatibility (all functions except view_cube and view_nd) supported
• get_rgb handles bands with no variation (color set to min value)
• Modified view_nd to support change in PyOpenGL API

Bug Fixes

• [Issue #16] Incorrect handling of alternate file extensions in envi.save_image
• [Issue #11] Incorrect handling of unsigned byte data type in ENVI files
• [Issue #13] As of version 1.9, numpy no longer provides oldnumeric submodule