Remove the single-doc operating mode of the resultset

[flimzy]

Fixes #812

[codecov]

Codecov Report

Attention: 6 lines in your changes are missing coverage. Please review.

Comparison is base (055b99d) 78.93% compared to head (77cada0) 78.87%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #819      +/-   ##
==========================================
- Coverage   78.93%   78.87%   -0.07%     
==========================================
  Files         166      166              
  Lines       13345    13339       -6     
==========================================
- Hits        10534    10521      -13     
- Misses       2371     2383      +12     
+ Partials      440      435       -5     

Files	Coverage Δ
db.go	92.68% <ø> (ø)
resultset.go	76.96% <62.50%> (-4.56%)	⬇️

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