Drupal 5 branch

Unfortunately we still have to use Drupal 5 because of other module dependencies, so I ported calendar_block back to Drupal 5 so that we could use it. There were no functional gains or losses although this does include the cal_days_in_month() patch from http://drupal.org/node/315109

The original module is not using unix line endings so the patch may or may not work. I've attached the entire module which has had it's files converted to LF just in case.