Custom tweak for CCLE compute: no fusion / bam download

[e-t-k]

see email: "CCLE compute on Treeshop"

• Don't download BAM file from bamqc at all
• Don't run fusion

Since this is blocking process at the moment, I'm going to do a hardcoded branch. When the time pressure is off I would like to go back and redo it "correctly" as follows:

• break all the steps in fab process into individual methods
• add toggles for the ones people have asked for toggles for (just fusion, no fusion, no download bam.)