Charles Ferguson 8d83c967d3 Support reporting diffs even when colordiff is not present.
The Travis macOS test systems do not appear to have colordiff present, so any
failures would mean that no output would be shown. This may also be a
problem for the other test scripts as well, but the invocation tests are
the ones being affected here.

We change our behaviour to downgrade to the plain diff tool if colordiff is
not present.
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