Add Protein Blocks structural alphabet #545

Job	Run time
Build source distribution	29s
Generate wheels matrix	11s
Check code style	12s
Test interfaces to databases and applications	7m 4s
Build & Test (cp310-manylinux_x86_64, ubuntu-latest)	10m 44s
Build & Test (cp311-manylinux_x86_64, ubuntu-latest)	10m 42s
Build & Test (cp312-manylinux_x86_64, ubuntu-latest)	10m 43s
Build & Test (cp313-manylinux_x86_64, ubuntu-latest)	10m 42s
Build & Test (cp310-macosx_x86_64, macos-latest)	10m 46s
Build & Test (cp310-macosx_arm64, macos-latest)	2m 35s
Build & Test (cp311-macosx_x86_64, macos-latest)	10m 26s
Build & Test (cp311-macosx_arm64, macos-latest)	2m 46s
Build & Test (cp312-macosx_x86_64, macos-latest)	7m 48s
Build & Test (cp312-macosx_arm64, macos-latest)	2m 59s
Build & Test (cp313-macosx_x86_64, macos-latest)	7m 32s
Build & Test (cp313-macosx_arm64, macos-latest)	3m 57s
Build & Test (cp310-win_amd64, windows-latest)	10m 36s
Build & Test (cp311-win_amd64, windows-latest)	10m 31s
Build & Test (cp312-win_amd64, windows-latest)	10m 30s
Build & Test (cp313-win_amd64, windows-latest)	10m 29s
Compile the CCD subset for structure.info from the wwPDB CCD	0s
Run benchmarks	0s
Build documentation	0s
Test interface to Muscle 5	0s
Upload documentation to GitHub Releases	0s
Upload package to GitHub Releases & PyPI	0s
	2h 21m 42s

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