Make a timestep getindex faster

[davidanthoff]

No description provided.

[codecov]

Codecov Report

Merging #860 (5fdd679) into master (6ea889e) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #860      +/-   ##
==========================================
+ Coverage   84.30%   84.32%   +0.01%     
==========================================
  Files          40       40              
  Lines        3792     3795       +3     
==========================================
+ Hits         3197     3200       +3     
  Misses        595      595              

Flag	Coverage Δ
unittests	84.32% <100.00%> (+0.01%)	⬆️

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

Impacted Files	Coverage Δ
src/core/time_arrays.jl	93.07% <100.00%> (+0.06%)	⬆️

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