New feature: Skipping testcases, determine by score type.
Slightly modified Job and Worker to support new feature.
Add ACM score type.
Update copyright.
Allow users to view statements and submissions even when their time frames or the contest has ended. But submit solutions, testings and token playings are not allowed.
Merge branches 'post-contest-viewing' and 'acm-and-smart-group-min' into hsgs

This branches support HSGS Training program.