Updated Inherited Deletions Vignette.

We constrct a set of regions to be filtered out.  It is the collection of centro/telomere gaps and low-mapabale regions provided by R. Scharpf.  After filteration we are left with less than half of the original 39 regions.  See vigentte at web-site http://www.biostat.jhsph.edu/~syounkin/vignettes/inherited-deletions.html#_centromeres_telomeres_amp_low_mapability .