Added a function to save an input file (and not run ARC on spot)

[alongd]

No description provided.

[codecov]

Codecov Report

Merging #140 into master will decrease coverage by 0.02%.
The diff coverage is 65.38%.

@@            Coverage Diff             @@
##           master     #140      +/-   ##
==========================================
- Coverage   42.65%   42.63%   -0.03%     
==========================================
  Files          27       27              
  Lines        6095     6105      +10     
  Branches     1576     1578       +2     
==========================================
+ Hits         2600     2603       +3     
- Misses       3113     3118       +5     
- Partials      382      384       +2

Impacted Files	Coverage Δ
arc/scheduler.py	19.03% <100%> (-0.71%)	⬇️
arc/main.py	46.89% <22.22%> (-0.45%)	⬇️
arc/common.py	83.09% <86.66%> (+0.42%)	⬆️
arc/reaction.py	41.92% <0%> (ø)	⬆️

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