Update odesolvers

[dkarrasch]

... and docs

Closes #87.

[codecov-commenter]

Codecov Report

Merging #86 (bd0038c) into master (e9ea1d1) will increase coverage by 0.26%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #86      +/-   ##
==========================================
+ Coverage   56.98%   57.25%   +0.26%     
==========================================
  Files          17       17              
  Lines        3071     3088      +17     
==========================================
+ Hits         1750     1768      +18     
+ Misses       1321     1320       -1     

Impacted Files	Coverage Δ
src/odesolvers.jl	86.53% <100.00%> (ø)
src/dynamicmetrics.jl	89.59% <0.00%> (+0.12%)	⬆️
src/diffusion_operators.jl	87.50% <0.00%> (+0.24%)	⬆️
src/ellipticLCS.jl	83.98% <0.00%> (+0.24%)	⬆️
src/gridfunctions.jl	42.92% <0.00%> (+0.25%)	⬆️
src/boundaryconditions.jl	73.71% <0.00%> (+0.27%)	⬆️
src/util.jl	77.30% <0.00%> (+0.32%)	⬆️
src/pointlocation.jl	19.64% <0.00%> (+0.48%)	⬆️
src/advection_diffusion.jl	58.22% <0.00%> (+0.53%)	⬆️

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