Fix to Issue#181

[Myrkwid]

This is my fix #181.
Using the mentioned rstrip() for the creation of the default value of filename in result_colletion.jl the described error will no longer occur.
By also adding rstrip() to projectdir() function, the error is also fixed if collect_results!() is called using defined variables using datadir() (as is done in update_results_tests.jl).
To demonstrate that, I included a test within update_resluts_tests.jl that checks if the bugged file is created.
In the case that the wrongly named and placed file is created, the test will remove it anyways, since it would interfere with the test regarding the dimensions of the dataframes (e.g. @test size(cres2) == (6, 7)).

I hope you will find this helpful!

[Datseris]

We do find this helpful! Thanks!

[codecov]

Codecov Report

Merging #380 (f96a51a) into main (6d95eb1) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #380   +/-   ##
=======================================
  Coverage   90.82%   90.82%           
=======================================
  Files           8        8           
  Lines         752      752           
=======================================
  Hits          683      683           
  Misses         69       69           

Impacted Files	Coverage Δ
src/result_collection.jl	98.18% <ø> (ø)
src/project_setup.jl	87.57% <100.00%> (ø)

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