Rename instananeousRates globally to reactionRates.

[spco]

Fixes part 1 of #320

[codecov]

Codecov Report

Merging #349 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master     #349   +/-   ##
=======================================
  Coverage   90.36%   90.36%           
=======================================
  Files          15       15           
  Lines        2096     2096           
=======================================
  Hits         1894     1894           
  Misses        202      202

Flag	Coverage Δ
#build	65.36% <92.85%> (ø)	⬆️
#tests	89.83% <92.85%> (ø)	⬆️
#unittests	34.44% <21.42%> (ø)	⬆️

Impacted Files	Coverage Δ
src/dataStructures.f90	94.92% <ø> (ø)	⬆️
src/atchem2.f90	91.49% <100%> (ø)	⬆️
src/solverFunctions.f90	91.56% <100%> (ø)	⬆️
src/parameterModules.f90	100% <100%> (ø)	⬆️
src/outputFunctions.f90	89.1% <100%> (ø)	⬆️
src/inputFunctions.f90	86.95% <100%> (ø)	⬆️

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