Lazy copy

[chfw]

delivers #28

[chfw]

Please note: even though source and dest are the same file, however, moban has never been run, the copying will happen at least once.

[codecov-io]

Codecov Report

Merging #69 into dev will decrease coverage by 0.26%.
The diff coverage is 94.28%.

@@            Coverage Diff             @@
##              dev      #69      +/-   ##
==========================================
- Coverage   98.82%   98.56%   -0.27%     
==========================================
  Files          32       32              
  Lines        1280     1325      +45     
==========================================
+ Hits         1265     1306      +41     
- Misses         15       19       +4

Impacted Files	Coverage Δ
moban/engine.py	98.62% <100%> (+0.66%)	⬆️
moban/main.py	100% <100%> (ø)	⬆️
tests/test_copier.py	100% <100%> (ø)	⬆️
tests/test_hash_store.py	100% <100%> (ø)	⬆️
moban/reporter.py	95.34% <50%> (-2.22%)	⬇️
moban/copier.py	96.66% <85.71%> (+0.23%)	⬆️
moban/hashstore.py	96.96% <88.88%> (-3.04%)	⬇️
tests/test_template.py	89.74% <0%> (-5.13%)	⬇️

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