…tch_multiple_sra_to_bams

add workflow to download multiple SRA accessions to multiple bams: fetch_multiple_sra_to_bams; this is useful in the event a sample is associated with multiple sequencing runs (i.e. more than one SRR###). It also adjusts the Fetch_SRA_to_BAM task to find metadata for the requested run, in the event multi-run metadata is returned for a given accession

…) function not available until WDL >= 1.1)

name the output tsv file using the first specified ID since we are operating under WDL 1.0 (the `sep()` function is not available to join arrays of strings until WDL >= 1.1, and `~{sep="_" variable}` seemingly does not work outside a command block)

…dinstitute/viral-pipelines into ct-pluralize-fetch-sra-to-bam

try googleLegacyMachineSelection to set GCP machineType, per broadinstitute/cromwell@7fa57a0

ask for valid storage for N2
https://cloud.google.com/compute/docs/disks/local-ssd#choose_number_local_ssds