Per Brinch Hansen pages updated

After the scan of Brinch Hansen on Pascal compilers I went on and also scanned the book on Edison: Programming a Personal Computer.

The Per Brinch Hansen now are updated too, the Alfred Hartmann book on Concurrent Pascal added, the Software: Practice and Experience issue on Edision scanned and converted, all articles by per Brinch Hansen listed. Enjoy the works of one of the pioneers: simplicity and parallel programming Per Brinch Hansen!