Fix bed file output's trailing tabs

[gartician]

Hi RGT devs, thank you for your valuable bioinformatic contribution to the regulatory genetics space. This issue pertains to multiple packages in RGT.

There is a trailing tab the bed outputs of footprinting step in HINT-ATAC and the motifanalysis function. While seemingly benign, software like bedtools would throw an error which inhibits users from further downstream analysis. Since this problem happens across different RGT packages, I am hesitant to fix everything at once and just want to notify everyone in general.

These trailing tabs can be viewed by cat -t <file.bed> | head. The following is the output of footprinting and motifanalysis, respectively:

footprinting

motifanalysis

[fabio-t]

Thanks, we'll have a look.