ANNOUNCE: Welcome Mark Larson

Mark has joined the project to give the code the once over from an optimization point of view.

Mark has a excellent track record in producing major wins for other CPU bound software, and he has already spotted some optimizations in heavily called code inside pnm2ppa.

Depending on Mark's workload and desires, pnm2ppa might get a small (or large) bump in performance.

When a release is ready for testing, it will be announced.

Andrew