Needed Command Functionality

Chimera2 command functionality needed for early release(s) based on Early Release Requirements.

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

Late summer release

Initial versions (not necessarily final/full implementations) of:

• open (suggest same general syntax as Chimera1, possibly adjusting prefixes; covers both local files and web-fetch)
• display, modeldisplay (suggest replacing with show/hide and eliminating our current show)
• color (suggest consolidating with rainbow but leaving color-by-attr and color-by-field separate)
• ribbon (suggest replacing with cartoon and including spline and any other whole-chain parameters)
• surface (see ​command and category thoughts)
• repr, ribrepr,ribscale, surfrepr (suggest consolidating into a new style command, adding cartoon cylinder parameters, and including pseudobonds)
• volume (redundancy with show/hide/color etc. OK with me, but should review structure and keywords vs. the negotiable ​command guidelines.)

Extremely useful catchalls, suggest retaining as permanent commands even though there will be some redundancy:

• 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)

GUI-only, or do we need commands?

• select (including up/down)
• save/restore session
• save image

December release