Add support for interleaved FASTQ files

[BrunoGrandePhD]

Thanks for developing this! This will certainly allow us to confidently delete original data files by first verifying data integrity.

I do have a feature request: it would be useful to have support for interleaved FASTQ files (where read pairs are consecutive in the file; compatible with BWA MEM).

Also, perhaps once this is implemented (if you choose to do so), could you create a new release with all the commits since v1.0? Thanks.