Extended Mock DDplan up to DM~10000 (DM_max=9866.4)
Changed 'PALFA2_presto_search.py' to create singlepulse plots that go up to DM~10000
Changed downsample factor for highest DM step in DDplan from 64 to 30, since 30 is the highest factor (other than 509) that divides into the blocksize of 15270.
Sort (just alphabetically) the input filenames so that Mock 's0' file is before 's1' in 'search.py'