Add alphafold command Python doc strings

[goddard@…]

The following bug report has been submitted:
Platform:        macOS-14.5-arm64-arm-64bit
ChimeraX Version: 1.9.dev202405132341 (2024-05-13 23:41:14 UTC)
Description
Add alphafold command documentation strings and include them in the programmer's guide.  Antony Merlin Jose asked about these Python APIs on the ChimeraX mailing list on May 24, 2024.

Log:
UCSF ChimeraX version: 1.9.dev202405132341 (2024-05-13)  
© 2016-2024 Regents of the University of California. All rights reserved.  
How to cite UCSF ChimeraX  

> usage alphafold

Subcommands are:

  * alphafold contacts
  * alphafold dimers
  * alphafold fetch
  * alphafold interfaces
  * alphafold match
  * alphafold monomers
  * alphafold pae
  * alphafold predict
  * alphafold search

  




OpenGL version: 4.1 Metal - 88.1
OpenGL renderer: Apple M2 Ultra
OpenGL vendor: Apple

Python: 3.11.4
Locale: UTF-8
Qt version: PyQt6 6.6.1, Qt 6.6.1
Qt runtime version: 6.6.3
Qt platform: cocoa
Hardware:

    Hardware Overview:

      Model Name: Mac Studio
      Model Identifier: Mac14,14
      Model Number: Z1800003VLL/A
      Chip: Apple M2 Ultra
      Total Number of Cores: 24 (16 performance and 8 efficiency)
      Memory: 64 GB
      System Firmware Version: 10151.121.1
      OS Loader Version: 10151.121.1

Software:

    System Software Overview:

      System Version: macOS 14.5 (23F79)
      Kernel Version: Darwin 23.5.0
      Time since boot: 3 days, 18 hours, 54 minutes

Graphics/Displays:

    Apple M2 Ultra:

      Chipset Model: Apple M2 Ultra
      Type: GPU
      Bus: Built-In
      Total Number of Cores: 60
      Vendor: Apple (0x106b)
      Metal Support: Metal 3
      Displays:
        PHL 278B1:
          Resolution: 3840 x 2160 (2160p/4K UHD 1 - Ultra High Definition)
          UI Looks like: 1920 x 1080 @ 60.00Hz
          Main Display: Yes
          Mirror: Off
          Online: Yes
          Rotation: Supported


Installed Packages:
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    charset-normalizer: 3.3.2
    ChimeraX-AddCharge: 1.5.17
    ChimeraX-AddH: 2.2.6
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    ChimeraX-AlignmentMatrices: 2.1
    ChimeraX-Alignments: 2.12.6
    ChimeraX-AlphaFold: 1.0
    ChimeraX-AltlocExplorer: 1.1.1
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    ChimeraX-Tug: 1.0.1
    ChimeraX-UI: 1.39.2
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    ChimeraX-UnitCell: 1.0.1
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    ChimeraX-VIPERdb: 1.0
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    ChimeraX-vrml: 1.0
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    ChimeraX-WavefrontOBJ: 1.0
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[Tom Goddard]

There are 9 alphafold subcommands with many arguments that would need to be described.

These Python routines are not likely to be used in ChimeraX Python scripts so adding detailed documentation is not a high priority.