libdap-3.22.0 for Hyrax-1.18.0

News for libdap-3.22.0

• Multi-pass overhaul of the test coverage tooling: switched to gcovr-based reporting (including a SonarQube-compatible format), fixed issues, and documented how to generate the coverage data.
• Recurring warnings cleanup across the codebase: removed legacy unary_function usage, added override throughout, and fixed warnings surfaced in tests and on GitHub Actions builds over several passes.
• Fixed a segmentation fault caused by bad data in a DAP4 attribute.
• Removed the macos-intel runner from the GitHub Actions CI matrix.
• Added an error message for when a DAP4 dimension can't be found.
• Bumped the DMR version, then reverted it after it caused compatibility problems.
• CMake migration: initial CMake build, install step, shared-library versioning fixes, presets, integration test support (DAS/DMR/EXPR), and cleanup, ending with CMake plus autotest support.
• Sped up the GitHub Actions workflow.
• Added unit tests for utils::segmented_read() and utils::segmented_write().
• Expanded and improved the libdap README and general documentation.
• Autotools/configure fixes: updated configure.ac for autoconf 2.72, fixed cppunit detection, stopped make clean from deleting config.log, then refactored configure.ac further.
• Added and iterated on VS Code support for the autotools build (tasks/launch config, customizable settings.json, supporting README).
• Experimented with Codex-generated unit tests, which surfaced a real bug in the process.
• Added support for tracking test deployments.
• Added RHEL9 build/packaging support to CI.
• Swapped a libxml include to fix a build issue.
• Switched libdap/HTTPCache singletons over to the Meyers singleton pattern.
• Fixed a DAP4 serialization bug.
• Fixed and merged in long-stale DMR-to-DAP2/DDS conversion work.
• Made DAP4 checksums optional and fixed related HTTP test handling.
• Fixed a batch of tests with bad/null baseline files.
• Refactored streaming code (xsputn) to support sending variables larger than 2GB.
• Fixed DAP4 enum handling for nested groups and added a way to check whether a group contains a given enum.
• Fix to HTTPConnect.
• Minor refactor of the D4Sequence code.
• Refactored dmr-test ahead of investigating an ASAN bug.
• Made the large chunked_iostream_test data write optional to speed up CI runs.
• Checkpointed a large response-handling refactor (not yet safe for multi-process use).