module for sampling genomic sequences

 Standalone module for sampling genomic sequences. It supports two modes,
 random subsampling of sequencer data to a desired depth (given the
 reference length) and file splitting to desired size in bytes.
 .
 Rampler takes as first input argument a file in FASTA/FASTQ format which
 can be compressed with gzip. The rest of input parameters depend on the
 mode of operation. The output is stored into a file(s) which is in the
 same format as the input file but uncompressed.