fix some tregex_engine issues, load_ and save_result for concordances
fix some tregex_engine issues, load_ and save_result for concordances


Former-commit-id: 77f28d767d24532c1f7db92a5b8350baa751b645 [formerly abd4daeabbcb350ce28b790c8fe82129b1f0a154]
Former-commit-id: 7cd5efa6d81e436332d0cc899945e844d5e3e32b
SigridK/corpkit,SigridK/corpkit