fix non-independent small_idempotents iterators

[kalmarek]

we now reset the iterator to make it iterable multiple times and iterate (in Iterators.product) over independent copies

This is slightly heavier but correct ;)

[codecov]

Codecov Report

Base: 86.10% // Head: 86.39% // Increases project coverage by +0.29% 🎉

Coverage data is based on head (d9119e8) compared to base (5d88715).
Patch coverage: 100.00% of modified lines in pull request are covered.

❗ Current head d9119e8 differs from pull request most recent head 40aa645. Consider uploading reports for the commit 40aa645 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #51      +/-   ##
==========================================
+ Coverage   86.10%   86.39%   +0.29%     
==========================================
  Files          17       17              
  Lines        1101     1110       +9     
==========================================
+ Hits          948      959      +11     
+ Misses        153      151       -2     

Flag	Coverage Δ
unittests	86.39% <100.00%> (+0.29%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/matrix_projections.jl	79.34% <ø> (ø)
src/minimal_projections.jl	93.75% <100.00%> (+3.60%)	⬆️

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