fixed memory leak in DBTArraysHolder #465

We had been leaking the array of DBTs itself (but not the data inside the
DBTs).

Also made it noncopyable to be safe.

closes #465
added NEWS for 1.1.1
tokumx-1.1.1-pre-
Merge branch 'bugs/465' into releases/tokumx-1.1
tokumx-1.1.1-rc.0