disable libardour unit tests that do not function correctly (for windows, at least)
Add --single-tests option to also build each libardour test as a separate program
Add test_search_path function in PBD testsuite
Use test_search_path to find test data in xpath test
Add test_search_path function in libardour testsuite
Use test_search_path function in ardour test
theoretically: "Add new_test_output_dir to common libardour test" but actually features addition of new files, thus losing git history for these two which came from tim mayberry
add new files from test changes by timbyr
Use common test function to create temporary session
Fix portability of test and use temporary test
Remove non-portable and unnused header includes