Released version 2.2b of Kaprekar Series Generator.

This is more of a code refactoring release. The code was changed to be more modular. The serialization, SVG generation and statistics code had crept into the Kaprekar Engine. I extracted those into separate classes - this also fixed some cut-and-paste code.

The only bug-fix in this code is for the progress bar in the GUI - the progress bar would not show the progress while searching for Kaprekar Series with more than 19 digits. This is fixed now. Well I had written the code, but for some reason I didn't invoke it. Ok, I thought it was an expensive call so didn't invoke it. Now I'm keeping track of the heartbeat and invoking it initially every 50 heartbeats and then every 500 heartbeats. It didn't seem to have too much of an overhead.

This change was in preparation of moving Kaprekar Series Generator to Java 1.5 to use the new language features.