cut_out_fasta_multiple: cut_out_fasta_multiple
In markheron/pRon: pretty Representations of oligo-nucleotides

Cuts out multiple regions from a genome (DNAStringSet).

1	cut_out_fasta_multiple(chr, pos, strand, size, order, genome_dir)

`chr`	vector of chromosomes (DNAString) names where the sequences should be cutout from
`pos`	vector of central position for cuting out the region
`strand`	vector of "+"/"-" to specify if the forward or the reverse complement sequence shall be used
`size`	region size before and after the positions to cut out
`order`	what oligonucleotide order will later be used (to extend the cut region for symetry)
`genome_dir`	the directory where the chromosome fasta files can be found