Fix matching by SSSet distance

[KalelR]

As discussed in #143, filtering out repetitive (e.g., 4=>4) entries in rmap can lead to problems when key_retraction is used. A simple fix that works is to remove the filter line, as I'm doing here.

I've also added the test I was doing when I found this error. Without the filter, the code works great, resulting in the right column in this figure

Note that this is not the "actual" behavior of the system, as by construction the attractor at 0 moves to -5, as shown on the left column. This is however a consequence of matching by distance in state space, not a problem with the code.

[Datseris]

The current test added is unecessarily complex. This is not problem with continuation, it is a problem with matching, only,. There is no need to define a dynamical system or make a continuation.

Why don't you just use this code?

using Attractors

attractors_cont_simple = Dict{Int64, SVector{1, Float64}}[Dict(1 => [0.0]), Dict(1 => [0.0]), Dict(2 => [2.0], 1 => [0.0]), Dict(2 => [0.0], 1 => [2.0]), Dict(2 => [2.0], 3 => [4.0], 1 => [-5.0]), Dict(2 => [4.0], 3 => [-5.0], 1 => [2.0]), Dict(4 => [6.0], 2 => [0.0], 3 => [2.0], 1 => [4.0]), Dict(4 => [4.0], 2 => [0.0], 3 => [2.0], 1 => [6.0]), Dict(5 => [8.0], 4 => [6.0], 2 => [0.0], 3 => [2.0], 1 => [4.0])]
attractors_cont = [Dict(k=>StateSpaceSet(Vector(v)) for (k,v) in atts) for atts in attractors_cont_simple]


mapped_atts = deepcopy(attractors_cont)
matcher = MatchBySSSetDistance()
rmaps = match_sequentially!(mapped_atts, matcher)

fractions_cont = [Dict(1 => 1.0), Dict(1 => 1.0), Dict(2 => 0.8091908091908092, 1 => 0.19080919080919082), Dict(2 => 0.1906187624750499, 1 => 0.8093812375249501), Dict(2 => 0.18862275449101795, 3 => 0.6207584830339321, 1 => 0.1906187624750499), Dict(2 => 0.6211365902293121, 3 => 0.19042871385842472, 1 => 0.18843469591226322), Dict(4 => 0.4097706879361914, 2 => 0.19042871385842472, 3 => 0.18843469591226322, 1 => 0.21136590229312063), Dict(4 => 0.21115537848605578, 2 => 0.1902390438247012, 3 => 0.18824701195219123, 1 => 0.4103585657370518), Dict(5 => 0.21613545816733068, 4 => 0.1942231075697211, 2 => 0.1902390438247012, 3 => 0.18824701195219123, 1 => 0.21115537848605578)]

mapped_fracs = deepcopy(fractions_cont)
match_sequentially!(mapped_fracs, rmaps)

Furthermore, why are the basins such complex numbers instead of just 0.1, 0.2, ... etc.? You can make them programmatically from the attractors by equi-distributing the number 1 to all attractors.

[Datseris]

don't forget to increment patch version in Project.toml