Merge duct heating energy balance modifications into develop

[MilosAtz]

• Modified duct heating distribution and reordered coolant/duct calculation to conserve energy with duct heating.
• Implemented unit tests to confirm energy conservation.
• Updated existing unit tests

[codecov-commenter]

Codecov Report

Merging #3 (bd96c0b) into develop (355adf1) will increase coverage by 0.92%. The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           develop       #3      +/-   ##
===========================================
+ Coverage    68.08%   69.00%   +0.92%     
===========================================
  Files           42       42              
  Lines         8989     8992       +3     
===========================================
+ Hits          6120     6205      +85     
+ Misses        2869     2787      -82     

Impacted Files	Coverage Δ
dassh/__init__.py	100.00% <100.00%> (ø)
dassh/reactor.py	86.58% <100.00%> (+4.47%)	:arrow_up:
dassh/region_rodded.py	81.54% <100.00%> (+4.13%)	:arrow_up:
dassh/region_unrodded.py	90.63% <100.00%> (+2.24%)	:arrow_up:
dassh/read_input.py	71.17% <0.00%> (+0.20%)	:arrow_up:
dassh/table.py	98.18% <0.00%> (+0.82%)	:arrow_up:
dassh/logged_class.py	63.38% <0.00%> (+2.81%)	:arrow_up:

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