Pack (gzip) output good and bad reads about afterqc

[sfchen]

I think fq is enough imformative for fastq, but I will consider your suggestion:)

[sfchen]

Will add an option to support gzip the output files after processing is done.

[serge2016]

Moreover, maybe it would be better to use .good.fastq instead of .good.fq? It seams to me more common.

[sfchen]

gzip output has been enabled on master branch.

For gzipped input, then the output will be also gzipped.
If the input is not gzipped, you can enable --gzip or -z option to force gzip compression.

gzip input --> gzip output
ungzip input --> ungzip output
ungzip input + --gzip (-z) option --> gzip output

Use --compression to change the compression level (0~9), default is 2. The better the compression, the lower the speed.