extensions and fixes to useR=TRUE behaviour (closes #100)

[eddelbuettel]

No description provided.

[codecov]

Codecov Report

Merging #101 into master will decrease coverage by 1.13%.
The diff coverage is 70%.

@@            Coverage Diff            @@
##           master    #101      +/-   ##
=========================================
- Coverage   94.33%   93.2%   -1.14%     
=========================================
  Files           5       5              
  Lines         247     250       +3     
=========================================
  Hits          233     233              
- Misses         14      17       +3

Impacted Files	Coverage Δ
src/anytime.cpp	91.58% <70%> (-1.39%)	⬇️

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