Change order-dependent wording in testvdf
Change order-dependent wording in testvdf

When writing testcases it's best to assume that they won't be ran in any
given order. So things like "above" in function names should be avoided.

With this commit it seems that the most important unit tests for the
release have been written so we might as well close #10

Lagg/steamodd,miedzinski/steamodd