tests sp-mi and sp-x2: proper internal parameter alpha=1
(bug) tests "mc-mi-g" and "smc-mi-g": added a strict parameter (strict = !learning) necessary to call cmig.test(fast.pcor())
Added the IAMBFDR algorithm from Pena (2008).
Added MB + PC filtering methods as local search algorithms (learn.nbr()): "gs.pc", "iapc", "fast.iapc", "inter.iapc" and "fdr.iapc"