A default for GTEx run_PEER.R doesn't match the PEER library default

[kshakir]

The underlying PEER library uses a default alpha_pb of 0.1:

https://github.com/PMBio/peer/blob/40bc4b2cd92459ce42f44dfe279717436395f3f6/src/vbfa.cpp#L279-L282

Meanwhile the wrapper run_PEER.R uses a different default alphaprior_b of 0.01:

gtex-pipeline/qtl/src/run_PEER.R

Lines 19 to 22 in 8c0b763

	p <- add_argument(p, "--alphaprior_a", help="", default=0.001)
	p <- add_argument(p, "--alphaprior_b", help="", default=0.01)
	p <- add_argument(p, "--epsprior_a", help="", default=0.1)
	p <- add_argument(p, "--epsprior_b", help="", default=10)

Is this intentional? We noticed the difference while switching our pipeline over to the GTEx provided Dockerfile. We don't usually set these values, but we can reproduce our existing pipeline outputs by explicitly setting the CLI parameter back to 0.1.

Thanks for sharing so many wonderfully packaged tools!