DOC - updated streamline_tools example with the LocalTracking Framework

[gabknight]

Changed the call from EuDX to LocalTracking. EuDX is still the algorithm use here, but in the new framework.

[codecov-io]

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[skoudoro]

Thanks @gabknight. Should we keep the Eudx class or more generally eudx.py (old framework)?

[gabknight]

@skoudoro, no, no need to keep it as it is essentially the same as LocalTracking with PeaksAndMetricDG. I want to refactor this: remove eudx.py, rename PeaksAndMetricDG to EudxDG, and move the eudx tests.

This will be in the another PR addressing #1501.

[skoudoro]

ok, sounds good! Do you need help? Today, I can do this part of removing eudx.py and renaming PeaksAndMetricsDG

[gabknight]

@skoudoro sure give it a go if you have time. The tricky part will adjust the tests. It will be very good to do it, as the current PeakAndMetricDG is not properly tested.
If you don't, I will do it at the time RF the tracking.local package. I'll be away from now until 19.07, I'm not sure I can make it for the next release.

[skoudoro]

I just run the documentation and this example, everything looks good. merging

Thanks @gabknight!