`@to_kw` macro for easy boundary conditions

[anandijain]

I write the code, you write the docs :P

feel free to unexport or change stuff

[codecov[bot]]

Codecov Report

Merging #215 (ef56f35) into master (450fc88) will increase coverage by 1.85%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #215      +/-   ##
==========================================
+ Coverage   74.93%   76.79%   +1.85%     
==========================================
  Files          37       37              
  Lines        1851     1870      +19     
==========================================
+ Hits         1387     1436      +49     
+ Misses        464      434      -30     

Impacted Files	Coverage Δ
src/MOL_utils.jl	67.93% <100.00%> (+6.11%)	:arrow_up:
src/interface/solution/common.jl	19.69% <0.00%> (-22.73%)	:arrow_down:
src/MOL_discretization.jl	64.70% <0.00%> (-10.93%)	:arrow_down:
...ion/schemes/upwind_difference/upwind_difference.jl	84.05% <0.00%> (-4.35%)	:arrow_down:
src/system_parsing/pde_system_transformation.jl	39.28% <0.00%> (+0.59%)	:arrow_up:
src/discretization/differential_discretizer.jl	97.43% <0.00%> (+2.56%)	:arrow_up:
src/system_parsing/bcs/parse_boundaries.jl	87.78% <0.00%> (+6.10%)	:arrow_up:
src/discretization/discretize_vars.jl	86.66% <0.00%> (+6.66%)	:arrow_up:
...tization/schemes/half_offset_centred_difference.jl	100.00% <0.00%> (+13.15%)	:arrow_up:
... and 2 more

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[xtalax]

Deal, try get this to pass first though :)

[anandijain]

Seems good now

[xtalax]

Looks good, can you move out to_kw to its own file though? MOL_utils.jl is a monster in bad need of splitting up, and I want to keep it internally focused.

[anandijain]

I allowed edits by maintainers, mind doing that so it looks right to you?

[xtalax]

Sure, I'll get to this. Thanks for your contribution :)