Add better functionality to the Tier system used by the Accession file.

[grabear]

For the master accession files, we can control the workflow by giving the end user access to
priority labels that we define. For instance...

Our default set of tier labels:

• Priority Levels:

  • Higher priority genes are put through the pipeline first.

  • Numerical ranges from 1 to infinity

    • 0 = Do not execute
    • 1 = High Priority
    • 100000000 = Low Priority

  • Alternatively allow the user to create a YAML file

    • This allows for strings in the .csv files
    • For instance:

     Opioid: 1
     Alcohol: 2
     Cocaine: 3
     Opioid/Cocaine: 4

  • String levels

    • "Skip" could actually skip over genes that don't need to be analyzed right away
    • "Isoform-1-Insert-Gene-Here" could be used for identifying isoforms
      • Isoform-0-HTR1A (the desired gene to analyze)
      • Isoform-1-HTR1A

     Isoform-0-HTR1A: 1
     Isoform-1-HTR1A:  "Skip"

This could also be very useful when we get to parsing updated HGNC files directly.