Change mechanism for comparing data in test suites

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Issue #1813 new
Steven R. Brandt created an issue

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.

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