The way to call the pcm functions has changed
rb.pcm("option", var)
rb.pcm_set_frequency(freq) = becomes rb.pcm("pcmsetfrequency", freq)
added pcm.lua to the includes for conversion to old functions
if your script is broken by this change you simply add
`require("pcm")` to the top for the old functionality
added rb.pcm("calculatepeaks")
Change-Id: I092057b0c0b5575e567862661f122da1ca2680e8
