Highlight last five QSOs

A feature that Gav mentioned briefly when in OY, this will highlight the last five QSOs made to make it easier to see a pattern. (Five is arbitrary, and easily changed.)

Also includes misc changes such as renaming the .php.inc file to .inc.php, which reduces server configuration (file is executed as a .php without adding extention exceptions) and the database can be chosen with a GET string to make changing contest a client adjustment rather than server.