Improved vignettes
In plotMotifs function:
To avoid infinity as a value for fold change, 1 was added to number of occurences of each motif found in the foreground and background target sequences before the normalization.
Added angle param for the rotation angle of the axis labels.
Added removeNegLog2FC param to remove the RBPs having a negative log2FC.
volcanoPlot function:
In getMotifs function:
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