create_sgRNA_reference: A function to create a reference fasta and gtf for plasmid +...
In FloWuenne/cropseq.analysis:

This function takes as input a table containing the gRNA sequences and will output a .fasta and a .gtf file \ containing the merged plasmid + gRNA sequences and the gtf description to add them to a reference genome.

1 2	create_sgRNA_reference(sgRNA_table, name = "name", sequence = "sgRNA_sequence", assay = "original", outdir = ".")

`sgRNA_table`	The table containing the sgRNA sequences and annotation.
`name`	The name of the column in sgRNA_table that should be used to label the fasta sequences
`sequence`	The actual sgRNA sequence
`assay`	The type of CRISPR assay that is being performed. If set to "activation", the tracr backbone is replaced by a tracr MS2 backbone used in VP64 screens.
`outdir`	The directory where the .fasta and .gtf files will be saved. Default = current working directory (".")