---------------
- Add new function to find a command or shared object file in the PATH (e.g. in
environment variables). See commoncode.command.find_in_path()
- Add new simplified the commoncode.command.execute() function.
- Add support for Python 3.10
- Update tests to cope with Python 3.6 bug https://bugs.python.org/issue26919
- Adopt latest skeleton with configure scripts updates
Breaking API changes:
- commoncode.command.load_shared_library() now ignores the lib_dir argument
- commoncode.command.execute2() is deprecated and ignores the lib_dir argument
it is replaced by commoncode.command.execute()
- In commoncode.testcase get_test_loc() "exists" argument has been renamed to
"must_exist". It has also been added to FileDrivenTesting.get_test_loc()
method.