Make VAST work on 32-bit platforms.
Make VAST work on 32-bit platforms.

Closes #60.

mavam/vast,mavam/vast,pmos69/vast,mavam/vast,pmos69/vast,vast-io/vast,vast-io/vast,pmos69/vast,vast-io/vast,vast-io/vast,pmos69/vast,mavam/vast,vast-io/vast