Major release -- boatload of new features

Overview

There are many new features and bug fixes in this release. The most salient include

• Compatability with the new ff-HEDM config introduced in https://github.com/HEXRD/hexrd/releases/tag/0.9.0
• Beam specification options for X-ray source vector, with ability to set source distance from components or manually
• Additional of pinhole camera distortion utilities for
  • offset sample layer distortion
  • pinhole line distortion (rudimentary; room for improvement with JRR's code)
  • Layer-specific "dewarping" of the polar image
• Masks
  • Ability to merge masks with existing panel buffer
  • Fixes to threshold mask
  • Addition of pinhole critical angle masking

What's Changed

• Clear unaggregated images also during images clear by @psavery in #1269
• Fix max_file_frames and max_total_frames functionality by @bnmajor in #1266
• Update python versions in instructions by @cjh1 in #1268
• Use all frames if no wedges provided by @bnmajor in #1274
• Add ability to delete grains in some dialogs by @psavery in #1259
• Update new active hkl indexing for eta omega maps by @psavery in #1264
• Add beam vector specification by components by @psavery in #1271
• Export indexing fitgrains config by @bnmajor in #970
• Update main window checkboxes on state load by @psavery in #1277
• Highlight grain row when point is picked by @psavery in #701
• Update active material energy with visible ones by @psavery in #1280
• Prune overlays immediately when materials change by @psavery in #1282
• Add pinhole distortion options to powder overlay editor by @psavery in #1275
• Panel buffer options by @bnmajor in #1281
• Llnl import tool by @bnmajor in #1286
• Add about dialog by @cjh1 in #1284
• Add menu item to view loaded images by @bnmajor in #1288
• Move About to new Help menu by @cjh1 in #1289
• Menu rename by @joelvbernier in #1290
• Add pinhole distortion option by @psavery in #1292
• Allow clipping powder overlays with panel buffer by @psavery in #1293
• force nsteps to be integer by @joelvbernier in #1291
• Pinhole distortion fixes by @psavery in #1294
• Do not switch to raw upon apply pinhole mask by @psavery in #1298

Full Changelog: 0.8.18...0.9.0