Gh issues

[mstackhouse]

Adessing several bugs:

• Issue with VARN sorting #202
• Don't remove units attribute of difftime when cleaning data on pre-process #184
• Update vignettes using options to reset options back to defaults to avoid CRAN inconsistencies  #186

[codecov]

Codecov Report

❌ Patch coverage is 98.07692% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 95.41%. Comparing base (dffbbdb) to head (219afb8).
⚠️ Report is 6 commits behind head on devel.

Files with missing lines	Patch %	Lines
R/sort.R	98.03%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##            devel     #204      +/-   ##
==========================================
+ Coverage   95.38%   95.41%   +0.02%     
==========================================
  Files          46       46              
  Lines        3665     3685      +20     
==========================================
+ Hits         3496     3516      +20     
  Misses        169      169              

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