Major amendments to otu functions & bug fixes.

improved waiting method for startgfServer(). pslToRangedData is
pslToRangedObject and gains asGRanges parameter. Minor bug fix in
clusterSites which merges high locations to lower now. otuSites() gains
parallel functionality. Added otuSites2() which works by integer
locations instead of discrete ones. Sites feature in findIntegrations
removes psl file columns before saving it back to sampleInfo object.