Optimization containerization

[cmorganl]

@Goulustis wrote a singularity image for samsum running and Ubuntu 18.04 image.

@Goulustis converted the Python class 'AlignmentDat' into the class 'Match' in the C++ extension _sam_module. Now, the Match instances can be used in Python, since they're declared as Python objects in the C++ extension. Previously, Match instances would be created for each alignment, converted to lists where each element of the list represented an attribute of Match, then these strings would be used to instantiate AlignmentDat instances. That was super hacky and this is a huge improvement over the previous method. Thanks Matthew!

[codecov-commenter]

Codecov Report

Merging #10 into master will decrease coverage by 2.50%.
The diff coverage is 63.63%.

@@            Coverage Diff             @@
##           master      #10      +/-   ##
==========================================
- Coverage   67.43%   64.93%   -2.51%     
==========================================
  Files          10       10              
  Lines         562      559       -3     
  Branches       77       78       +1     
==========================================
- Hits          379      363      -16     
- Misses        158      172      +14     
+ Partials       25       24       -1     

Impacted Files	Coverage Δ
src/samsum/commands.py	64.15% <ø> (ø)
src/samsum/alignment_utils.py	70.83% <22.22%> (-13.71%)	⬇️
src/samsum/file_parsers.py	67.27% <88.88%> (-1.70%)	⬇️
src/samsum/__init__.py	100.00% <100.00%> (ø)
src/samsum/classy.py	78.33% <100.00%> (ø)