port sample programs from www.persistit.com

Get the existing example programs that ship in the www.persistit.com downloadable evaluation kit to run with our Akiban version. The changes are mechanical: in the old version many methods of the Persistit.java class itself were static, so, for example, you would say Persistit.initialize(), Persistit.getExchange(), etc. With our current version they are not static. You do this:

Persistit p = new Persistit();
p.initialize()...