FlatFile, OAHash, OAFHash unit test cursor destruction issue

[iondbproject]

Currently, the above three implementations leak memory, as their cursors are created but never destroyed. The reason why they're never destroyed is due to a conflict in how they're written: In certain cases, stack memory is bound to the cursor, which cursor->destroy then attempts to free. In most cases this results in a segfault. As a temporary measure, most cursor->destroy calls have been commented out.

The relevant tests should be refactored to avoid the situation of free-ing stack memory.

Reference: test_oadictionaryhandler.c:353 and 380.

[iondbproject]

Tests have been refactored and issue has been resolved.