Zip process

[gaborcsardi]

Closes #18.

To be refined.

[codecov-io]

Codecov Report

Merging #22 into master will decrease coverage by 0.48%.
The diff coverage is 84.7%.

@@            Coverage Diff             @@
##           master      #22      +/-   ##
==========================================
- Coverage   85.06%   84.58%   -0.49%     
==========================================
  Files           8       10       +2     
  Lines         375      493     +118     
==========================================
+ Hits          319      417      +98     
- Misses         56       76      +20

Impacted Files	Coverage Δ
R/zip.R	100% <ø> (ø)	⬆️
src/rzip.c	93.44% <100%> (+8.3%)	⬆️
src/zip.c	72.61% <64.51%> (-1.84%)	⬇️
R/process.R	89.85% <94.73%> (+5.98%)	⬆️
src/tools/cmdunzip.c	71.42% <0%> (ø)
src/tools/cmdzip.c	78.18% <0%> (ø)

---

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[codecov-io]

Codecov Report

Merging #22 into master will decrease coverage by 0.29%.
The diff coverage is 82.26%.

@@            Coverage Diff            @@
##           master      #22     +/-   ##
=========================================
- Coverage   85.06%   84.77%   -0.3%     
=========================================
  Files           8        9      +1     
  Lines         375      486    +111     
=========================================
+ Hits          319      412     +93     
- Misses         56       74     +18

Impacted Files	Coverage Δ
R/zip.R	100% <ø> (ø)	⬆️
src/tools/cmdunzip.c	71.42% <ø> (ø)
src/rzip.c	93.44% <100%> (+8.3%)	⬆️
src/zip.c	72.61% <64.51%> (-1.84%)	⬇️
src/tools/cmdzip.c	78.18% <78.18%> (ø)
R/process.R	89.85% <94.87%> (+5.98%)	⬆️

---

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Δ = absolute <relative> (impact), ø = not affected, ? = missing data
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