Support for read and write of circuits to *.gz compressed files

[guyvdbroeck]

No description provided.

[codecov]

Codecov Report

Merging #100 (4c1f95f) into master (a6d61b1) will increase coverage by 0.08%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #100      +/-   ##
==========================================
+ Coverage   68.32%   68.41%   +0.08%     
==========================================
  Files          39       39              
  Lines        3299     3305       +6     
==========================================
+ Hits         2254     2261       +7     
+ Misses       1045     1044       -1     

Impacted Files	Coverage Δ
src/io/spn_io.jl	84.78% <ø> (ø)
src/io/io.jl	92.30% <100.00%> (+2.30%)	⬆️
src/Utils/misc.jl	41.33% <0.00%> (+1.33%)	⬆️

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