Common top-level directory for build infrastructure files
Description
The top level of LALSuite has accumulated a number of directories for common build infrastructure files, and it's starting to be a little cluttered. In addition, the top-level gnuscripts/ directory is being used to hold other build infrastructure files, such as debian/ and various maintenance scripts, which aren't part of Autotools and should have a home elsewhere.
This MR creates a top-level common/ directory to house the common conda/, doxygen/, gnuscripts/debian/, swig/, and test/ directories. I've also added a common/maintainer-scripts/ directory for various maintenance scripts. A common/README.md describes each directory in common/, subsuming the existing README.mds in the common/ subdirectories. All symlinks have been updated.
Moving the existing top-level directories to common/ shouldn't cause and problems in the build system; since the files under common/ are symlinked into the lal.../ directories, as far as the library-level build systems are concerned the files haven't actually been moved. (The top-level gnuscripts/ itself cannot be moved as it must have the same layout relative to configure.ac as in the lal.../ directories.)
Finally the top-level directory docker/ has been renamed to .docker/ consistent with the existing .gitlab-ci-*.Dockerfile files. (FWIW AFAICT .docker/startup isn't currently used anywhere.)
API Changes and Justification
Backwards Compatible Changes
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This change does not modify any class/function/struct/type definitions in a public C header file or any Python class/function definitions -
This change adds new classes/functions/structs/types to a public C header file or Python module
Backwards Incompatible Changes
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This change modifies an existing class/function/struct/type definition in a public C header file or Python module -
This change removes an existing class/function/struct/type from a public C header file or Python module