Needed Command Functionality

Chimera2 command functionality needed for early release(s) based on EarlyReleaseRequirements.

This is somewhat high-level; more detailed guidelines and examples are in ​Chimera2 Command-Structure Thoughts.

Late summer release

• open (suggest same general syntax as Chimera1, possibly adjusting prefixes)
• repr, ribrepr, surfrepr (suggest consolidating into a new style command)
• color (suggest consolidating with rainbow)
• display (suggest replacing with show/hide and eliminating current show command)
• volume (redundancy with show/hide/color etc. OK with me)
• set global settings: silhouettes, background color, shadows, lighting (if many sub-options, e.g. lighting, judiciously consider making a separate top-level command; also keeping a redundant but longer set command is OK with me)
• setattr (general set-attributes functionality; extremely useful as permanent command even though parts will become redundant)

December release