REF: Renaming of formulation types

[tasseff]

Closes #105.

[codecov]

Codecov Report

Merging #107 into master will increase coverage by 0.16%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #107      +/-   ##
==========================================
+ Coverage   84.96%   85.12%   +0.16%     
==========================================
  Files          24       24              
  Lines        2108     2104       -4     
==========================================
  Hits         1791     1791              
+ Misses        317      313       -4     

Impacted Files	Coverage Δ
src/WaterModels.jl	100.00% <ø> (ø)
src/core/function.jl	96.00% <ø> (ø)
src/form/crd.jl	97.53% <ø> (ø)
src/form/la.jl	98.78% <ø> (ø)
src/form/lrd.jl	94.54% <ø> (ø)
src/form/nc.jl	100.00% <ø> (ø)
src/util/obbt.jl	90.90% <ø> (ø)
src/core/types.jl	100.00% <100.00%> (ø)

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