Prepare v0.7 release

[Kolaru]

This PR introduces the v0.7 release.

It is expected to be the last release before version v1.0. Therefore all downstream packages are invited to test it and share opinions before v0.7 is released.

I will make an announcement in the Slack channel at least once this is merged.

@dpsanders @lbenet @OlivierHnt

[github-actions]

Benchmark Results

	master	cd7e5b5...	master / cd7e5b5...
10 dimensional/IntervalRootFinding.Krawczyk	3.74 ± 0.028 s	3.41 ± 0.034 s	1.1 ± 0.014
10 dimensional/IntervalRootFinding.Newton	52.2 s	53.1 s	0.983
Dietmar-Ratz/Dietmar-Ratz 1/IntervalRootFinding.Krawczyk	3.67 ± 0.14 μs	3.79 ± 0.18 μs	0.968 ± 0.059
Dietmar-Ratz/Dietmar-Ratz 1/IntervalRootFinding.Newton	3.66 ± 0.13 μs	3.81 ± 1.1 μs	0.958 ± 0.28
Dietmar-Ratz/Dietmar-Ratz 2/IntervalRootFinding.Krawczyk	0.108 ± 0.0014 ms	0.109 ± 0.0035 ms	0.993 ± 0.034
Dietmar-Ratz/Dietmar-Ratz 2/IntervalRootFinding.Newton	0.247 ± 0.011 ms	0.251 ± 0.011 ms	0.982 ± 0.062
Dietmar-Ratz/Dietmar-Ratz 3/IntervalRootFinding.Krawczyk	0.258 ± 0.013 ms	0.257 ± 0.014 ms	1 ± 0.077
Dietmar-Ratz/Dietmar-Ratz 3/IntervalRootFinding.Newton	0.182 ± 0.011 ms	0.182 ± 0.013 ms	0.997 ± 0.094
Dietmar-Ratz/Dietmar-Ratz 4/IntervalRootFinding.Krawczyk	0.0526 ± 0.0008 ms	0.0531 ± 0.00086 ms	0.989 ± 0.022
Dietmar-Ratz/Dietmar-Ratz 4/IntervalRootFinding.Newton	0.0353 ± 0.0016 ms	0.0356 ± 0.0027 ms	0.99 ± 0.087
Dietmar-Ratz/Dietmar-Ratz 5/IntervalRootFinding.Krawczyk	3.5 ± 0.16 μs	3.96 ± 0.18 μs	0.886 ± 0.057
Dietmar-Ratz/Dietmar-Ratz 5/IntervalRootFinding.Newton	3.54 ± 0.17 μs	3.6 ± 0.17 μs	0.981 ± 0.066
Dietmar-Ratz/Dietmar-Ratz 6/IntervalRootFinding.Krawczyk	14 ± 0.28 μs	14.5 ± 0.32 μs	0.961 ± 0.029
Dietmar-Ratz/Dietmar-Ratz 6/IntervalRootFinding.Newton	21.2 ± 0.52 μs	21.3 ± 0.57 μs	0.994 ± 0.036
Dietmar-Ratz/Dietmar-Ratz 7/IntervalRootFinding.Krawczyk	3.82 ± 0.2 μs	3.9 ± 0.2 μs	0.979 ± 0.072
Dietmar-Ratz/Dietmar-Ratz 7/IntervalRootFinding.Newton	3.79 ± 0.2 μs	3.9 ± 0.17 μs	0.972 ± 0.067
Dietmar-Ratz/Dietmar-Ratz 9/IntervalRootFinding.Krawczyk	4.18 ± 0.2 μs	4.19 ± 0.16 μs	0.998 ± 0.061
Dietmar-Ratz/Dietmar-Ratz 9/IntervalRootFinding.Newton	4.14 ± 0.19 μs	4.15 ± 0.16 μs	0.998 ± 0.06
Rastigrin stationary points/IntervalRootFinding.Krawczyk	0.149 ± 0.0012 s	0.149 ± 0.0017 s	0.999 ± 0.014
Rastigrin stationary points/IntervalRootFinding.Newton	0.141 ± 0.0013 s	0.141 ± 0.0024 s	0.999 ± 0.02
Smiley/Smiley and Chun (2001), Example 2.2/IntervalRootFinding.Krawczyk	2.73 ± 0.054 ms	2.69 ± 0.056 ms	1.01 ± 0.029
Smiley/Smiley and Chun (2001), Example 2.2/IntervalRootFinding.Newton	2.15 ± 0.045 ms	2.16 ± 0.052 ms	0.997 ± 0.032
Smiley/Smiley and Chun (2001), Example 5.2/IntervalRootFinding.Krawczyk	0.0386 ± 0.0038 s	0.0386 ± 0.0043 s	1 ± 0.15
Smiley/Smiley and Chun (2001), Example 5.2/IntervalRootFinding.Newton	0.034 ± 0.0042 s	0.0342 ± 0.0039 s	0.994 ± 0.17
Smiley/Smiley and Chun (2001), Example 5.4/IntervalRootFinding.Krawczyk	1.81 ± 0.044 ms	1.76 ± 0.034 ms	1.03 ± 0.032
Smiley/Smiley and Chun (2001), Example 5.4/IntervalRootFinding.Newton	1.82 ± 0.052 ms	1.81 ± 0.044 ms	1 ± 0.038
Smiley/Smiley and Chun (2001), Example 5.5/IntervalRootFinding.Krawczyk	5.4 s	5.47 s	0.987
Smiley/Smiley and Chun (2001), Example 5.5/IntervalRootFinding.Newton	5.13 s	5.12 s	1
time_to_load	0.404 ± 0.0062 s	0.401 ± 0.00069 s	1.01 ± 0.016

Benchmark Plots

A plot of the benchmark results have been uploaded as an artifact to the workflow run for this PR.
Go to "Actions"->"Benchmark a pull request"->[the most recent run]->"Artifacts" (at the bottom).

[OlivierHnt]

Fire away 🚀

[Kolaru]

Changing the default is making the doctests fail (as always), I'll fix that first :)

[Kolaru]

The doctests should now be fixed, but I notice #246 in the process.