MVP data appear to be phred+64

[wasade]

The metadata.yaml following the import of the raw sequences, and the metadata.yaml following demux, indicate the data are phred 33. However, that does not appear to be accurate as the character set used includes characters defined outside of phred 33 encoding (e.g., "["):

$ funzip sequences.fastq.gz | head
@HWI-EAS440_0386:1:23:17547:1423#0/1
TACGNAGGATCCGAGCGTTATCCGGATTTATTGGGTTTAAAGGGAGCGTAGATGGATGTTTAAGTCAGTTGTGAAAGTTTGCGGCTCAACCGTAAAATTGCAGTTGATACTGGATATCTTGAGTGCAGTTGAGGCAGGGGGGGATTGGTGTG
+
hhhdHddddddddfehhfhhhghggfhhhfhhgggfhhgfgdfcfhehfdgfhggfggfggffgddfgdffdgdaagaaddcbdccc]a^ad__a]_____ba_`a`__^__\]^OWZR\Z\\WYTZ_U^BBBBBBBBBBBBBBBBBBBBBB

I checked with @gregcaporaso and he indicated that it made sense given the age of the data.

At the time of creation of this issue, I do not believe there is a functional impact with the inaccuracy of metadata.yaml as quality scores are not interrogated explicitly by Q2 in this tutorial.

[jairideout]

Ouch! Good catch, I ported the issue here.