CheckSezpoz enhancements

This branch improves the `CheckSezpoz` utility class with a few enhancements. In particular, it writes out the `.settings/org.eclipse.jdt.apt.core.prefs` configuration file to leave off the datestamp comment, and include the `eclipse.preferences.version` key, to match the newest releases of Eclipse.

@dscho: Since you wrote `CheckSezpoz`, could you please review and merge if OK? Thanks!