improve error handling when file does not exist, and allow forcing se…

[samtkaplan]

…rial read

[codecov]

Codecov Report

Attention: Patch coverage is 86.66667% with 6 lines in your changes missing coverage. Please review.

Project coverage is 81.93%. Comparing base (743f07d) to head (ebc45e5).
Report is 7 commits behind head on master.

Files with missing lines	Patch %	Lines
src/FolderStorage.jl	86.66%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #18      +/-   ##
==========================================
- Coverage   83.17%   81.93%   -1.25%     
==========================================
  Files           1        1              
  Lines         107      155      +48     
==========================================
+ Hits           89      127      +38     
- Misses         18       28      +10     

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