support reloading broken files with IlmImfFuzzTest

[peterhillman]

This extends each of the IlmImfFuzzTest tools to accept an EXR file to load.
E.g. ./IlmImfFuzzTest testFuzzScanLines /var/tmp/imf_test_scanline_file_fuzz_broken.exr
This allows quicker debugging where a regular IlmImfFuzzTest run errors

Signed-off-by: Peter Hillman peterh@wetafx.co.nz

[cary-ilm]

I think it's worth a comment explaining the file argument: normally, the test runs on data generated on the fly, but the argument makes it possible to run the test on externally provided data, useful in debugging. Right?

[peterhillman]

I will add some command-line help to IlmImfFuzzTest and IlmImfTest to explain how to use them and update the PR

[cary-ilm]

Excellent!