implemented workaround for issue #160

[simschul]

Workaround for the issue in as.Node.data.frame when one node and one column of the data.frame share the same name. Note: the suggested workaround adds a new argument (suffix) to the function, suffixis then pasted to the column name.

[gluc]

Hey @simschul Simon, thank you so much. Will look into it! Best, Christoph

[gluc]

Hey, I'm getting a WARNING in the check:

* checking Rd \usage sections ... WARNING
Warning: Undocumented arguments in documentation object 'as.Node.data.frame'
  'suffix'

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 55.55556% with 4 lines in your changes missing coverage. Please review.

Project coverage is 84.65%. Comparing base (75dbb9b) to head (c124ab6). Report is 38 commits behind head on master.

Files	Patch %	Lines
R/node_conversion_dataframe.R	55.55%	4 Missing :warning:

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #171      +/-   ##
==========================================
- Coverage   85.06%   84.65%   -0.41%     
==========================================
  Files          16       16              
  Lines         904      932      +28     
==========================================
+ Hits          769      789      +20     
- Misses        135      143       +8     

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