Support iterable of points

[Luapulu]

I now also have a test for a pendulum. Docs are next on the to do list now.

[codecov]

Codecov Report

Merging #37 (62dea35) into master (54edafd) will decrease coverage by 0.33%.
The diff coverage is 90.69%.

❗ Current head 62dea35 differs from pull request most recent head 22756a1. Consider uploading reports for the commit 22756a1 to get more accurate results

@@            Coverage Diff             @@
##           master      #37      +/-   ##
==========================================
- Coverage   98.95%   98.61%   -0.34%     
==========================================
  Files           7        7              
  Lines         477      505      +28     
==========================================
+ Hits          472      498      +26     
- Misses          5        7       +2     

Impacted Files	Coverage Δ
src/PoincareInvariants.jl	92.85% <87.87%> (-0.90%)	⬇️
src/FirstFinDiffPlans.jl	100.00% <100.00%> (ø)
src/FirstFourierPlans.jl	100.00% <100.00%> (ø)
src/SecondChebyshevPlans.jl	100.00% <100.00%> (ø)
src/SecondFinDiffPlans.jl	100.00% <100.00%> (ø)

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