better errors in readDefaultConfig, make chooseFromList more space-tolerant

[orichters]

• Let readDefaultConfig tell you which file it couldn't find and where.
• chooseFromList now also accept 1, 3 with a space somewhere inside as input, of course only as long as the parser can understand it.
• Improve description of returnBoolean option

[codecov]

Codecov Report

Patch coverage: 76.92% and project coverage change: +0.20 🎉

Comparison is base (4448e22) 33.02% compared to head (28c32bf) 33.23%.

❗ Current head 28c32bf differs from pull request most recent head dda2775. Consider uploading reports for the commit dda2775 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #54      +/-   ##
==========================================
+ Coverage   33.02%   33.23%   +0.20%     
==========================================
  Files          51       51              
  Lines        1647     1652       +5     
==========================================
+ Hits          544      549       +5     
  Misses       1103     1103              

Impacted Files	Coverage Δ
R/readDefaultConfig.R	81.81% <75.00%> (-18.19%)	⬇️
R/chooseFromList.R	72.13% <80.00%> (-0.76%)	⬇️

... and 2 files with indirect coverage changes

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