Allow custom variable in .convertClonecall

[noranekonobokkusu]

This is a fix for #299 that allows a user to use custom variables of the combineTCR output to define clones.

[ncborcherding]

Great let me run the workflows and will get it merged. We're in the starting a manuscript for the new scRepertore. I think you have had some great finds in terms of bugs, let me know if you have suggestions or other pull requests.

[codecov]

Codecov Report

Attention: 4 lines in your changes are missing coverage. Please review.

Comparison is base (ce55335) 83.39% compared to head (2b8bb29) 83.81%.

Files	Patch %	Lines
R/utils.R	0.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #301      +/-   ##
==========================================
+ Coverage   83.39%   83.81%   +0.42%     
==========================================
  Files          40       40              
  Lines        2932     2917      -15     
==========================================
  Hits         2445     2445              
+ Misses        487      472      -15     

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[noranekonobokkusu]

@ncborcherding I do have some notes/questions/comments on several functions. Should I write them here as a list, or email them, or open new issues? For most of them, I cannot make pull requests right away as I don't know if the observed behavior of the function is intentional.

[ncborcherding]

Feel free to send them along via email , happy to take a look!