Fix an address-sanitizer failure in the checkpoint test: record numbers are 64-bits.
Fix some leaks in the checkpoint tester found by valgrind.
old-style function definition "()", not "(void)"
old-style function declaration
When we are restoring updates that couldn't be evicted, there can't be any earlier updates for the same key.

refs #961
Disable the fast checkpoint code in one more place.
Merge branch 'develop' into fast-checkpoints
Re-enable fast checkpoints.