This mostly required names for each test case, declarations of
previously-implicit variables since the new test framework is more
conservative with what it declares (the small extra effort to add
declarations is well worth the simplicity and improved readability),
and tweaks to work with not-really-constant defines.
Also renamed test_ -> test, replacing the old ./scripts/test.py,
unfortunately git seems to have had a hard time with this.
With the superblock expansion stuff, the test_format tests have grown
to test more advanced superblock-related features. This is fine but
deserves a rename so it's more clear.
Also fixed a typo that meant tests never ran with block cycles.
Christopher Haster