Change mechanism for comparing data in test suites

This test changes the way test data is compared. Instead of comparing line by line, it forms a key of the (t,x,y,z) coordinates and compares the values at those coordinates. Consequently, I also disable the check that the required number of procs are used. This allows us to have one set of test files, generated on a single proc, and run the test suite with multiple procs. This should make the disk space occupied by tests smaller, and make the existing tests more flexible.

Pull request: https://bitbucket.org/cactuscode/cactus/pull-requests/18/modify-the-test-utilities-so-that-a-test/diff

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