Customable naming

[cuom1999]

Currently, all test cases are named in one format test$$.in. However, it's quite hard to track which one is in which subtask or which one is an edge case. For example, it is great if we can name them like big$$.in and small$$.in with some configs. I would prefer if the configs are put in tests.sh because it's much easier to manage all test cases there. It already has the hashtag line to separate subtasks, what about putting another line right below for the name (use the default config if empty)?