Fix nightly gcc and clang builds

See merge request lscsoft/lalsuite!1030

Update .gitignore in lalpulsar and lalinspiral

See merge request lscsoft/lalsuite!1031

Fix Debian buster build

Closes #124

See merge request lscsoft/lalsuite!1025

- With automake 1.16.1-4 on Debian buster, BUILT_SOURCES cannot be used to
  force building libraries, since BUILT_SOURCES is run by "make dist"
- Instead just make liblalapps a dependency of all, check, and install rules
- Fix other Makefiles that weren't correctly initialising BUILT_SOURCES

- With automake 1.16.1-4 on Debian buster, BUILT_SOURCES cannot be used to
  force building libraries, since BUILT_SOURCES is run by "make dist"
- Instead, build src/ first, then src/mpi/, so that liblalinference.la is
  available for linking to binaries in src/mpi/

Fix bug in testing python stuff from tarballs

See merge request lscsoft/lalsuite!1029

means the tests don't fail, and has no other impact

it requires pycuda, which isn't a first-class dependency

the `lalinspiral.thinca` module (amongst others) look for the compiled `lalinsipral._thinca` module in the same directory, so if we want to test things, we need a symlink from the `.libs/` build path

Add CODEOWNERS for lalapps/src/ring/

See merge request lscsoft/lalsuite!1022

Move lalinference executables from lalapps to lalinference

See merge request lscsoft/lalsuite!673

Add missing python_provides in spec files

See merge request lscsoft/lalsuite!1024