Bug/folder creation

[willu47]

Fixes 161648445

• Don't allow DataFileInterface to create missing folders, instead raise an SmifDataException
• Fix fixtures so that the correct empty project directories are created

Probably want to move folder creation into the DataFileInterface, but add an "initialize" method to the DataInterface to setup a new smif project whatever the interface.

[codecov[bot]]

Codecov Report

Merging #257 into master will decrease coverage by 0.05%. The diff coverage is 50%.

@@            Coverage Diff             @@
##           master     #257      +/-   ##
==========================================
- Coverage   73.74%   73.68%   -0.06%     
==========================================
  Files          52       52              
  Lines        4292     4302      +10     
  Branches      518      521       +3     
==========================================
+ Hits         3165     3170       +5     
- Misses       1038     1042       +4     
- Partials       89       90       +1

Flag	Coverage Δ
#javascript	73.68% <50%> (-0.06%)	:arrow_down:
#python	83.85% <50%> (-0.08%)	:arrow_down:

Impacted Files	Coverage Δ
src/smif/data_layer/datafile_interface.py	84.68% <50%> (-0.41%)	:arrow_down:
...pp/src/components/ConfigForm/ModelRunConfigForm.js	6.66% <0%> (-0.08%)	:arrow_down:
src/smif/data_layer/memory_interface.py	87.75% <0%> (+0.12%)	:arrow_up:

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