dt adaptation

[mateuszbaran]

Some algorithms with adaptive dt. For a start, CG2(3).

[codecov]

Codecov Report

Merging #15 (88660b5) into main (8d13d5d) will increase coverage by 2.56%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #15      +/-   ##
==========================================
+ Coverage   93.33%   95.89%   +2.56%     
==========================================
  Files           7        8       +1     
  Lines         210      341     +131     
==========================================
+ Hits          196      327     +131     
  Misses         14       14              

Impacted Files	Coverage Δ
src/ManifoldDiffEq.jl	100.00% <ø> (ø)
src/operators.jl	100.00% <ø> (ø)
src/error_estimation.jl	100.00% <100.00%> (ø)
src/frozen_solvers.jl	100.00% <100.00%> (ø)
src/problems.jl	66.66% <100.00%> (+6.66%)	⬆️

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[kellertuer]

The documentations I asked for are there, the tests run fine – this is good :)