Change isbi_utils from writing files to comparing in memory

[R-Ding]

What

• Replace writing to GT and result ISBI-style .txt files with saving an array of ISBI-style dictionaries and comparing those.
• Modifying isbi_utils_tests to test the new approach

Why

• Comparing in memory is quicker and allows for less chances of error

[MekWarrior]

Code changes looks good. Seems to run a bit slower, which is surprising but in my one live test it did replicate the results of the original code.

[willgraf]

I'm hoping we can make this backwards compatible to prevent having to update any miscellaneous code that may break.

Ideally the functions that used to exist will still exist by name and do what they are supposed to do. Internally those functions can change and call other/new functions to keep them short.

Keep old parameters but just default them to None so they do nothing. If users try to use them, please warn that the arg is deprecated.

[willgraf]

If you could also add a test for benchmark_division_performance, that would be very helpful. It's the last function in the file that is untested.

[willgraf]

Apologies for my confusing statements earlier, I got mixed up on the different functions.

I left a bunch of comments, please follow up if anything isn't clear.

[willgraf]

Looks great! Very pleased with where it is - just one last small change for deprecation warning.

[R-Ding]

Looks great! Very pleased with where it is - just one last small change for deprecation warning.

Thanks for all the help!

[willgraf]

LGTM, good changes and well tested.

The only failing checks are for Python 3.5 coverage, which does not seem like a blocker to me.

[MekWarrior]

Looks good. Would just like clarification on one thing.

[MekWarrior]

Great work!