Fix the op-depth calculations in db-tests.c, to no longer trip +- every validation rule of op-depths. This involved changing a local added subdir (with descendants at the same op-depth!) into a copy.
These testcases were written before NODES introduced op-depth, and the tests were only updated to not trigger test failures.
* subversion/libsvn_wc/wc-checks.sql (STMT_STATIC_VERIFY): Make ancestor check a bit stricter.
* subversion/tests/libsvn_wc/db-test.c (TESTING_DATA): Tweak setup. (test_pdh): Install ancestor for not-present to avoid error. (validate_abspath): Tweak function to print paths on error. (test_scan_addition): Tweak expectations after transforming add into a copy. (test_scan_deletion): Tweak test. Minor change to handle working delete.