Simplify linking fastq files to their library id.

Simplify linking fastq files to their library id.

Unlike my previous effort which required the fastq generation
script to generate dc:source entries to match fastqs to libraries,
this version just parses the generated fastq filename.

This does mean that a manually generated file might not work.

I accomplished this by writing a class to generate the
fastq (for submission) filenames and to parse them, so at least
all that code is in one place.

Also after attaching the fastq metadata to the file node,
I discovered I the websites use of language tags on strings
made my query fail. So I changed the toTypedNode to take an optional
language tag. (Defaults to "en").