rescue partially downloaded files
rescue partially downloaded files

- if a connection error, wget will generate a new file with a .1 (or
  higher number) at the end. Find the max and rename the file
- the checksum step runs after this so will catch if still a problem

dpastling/cnv_pipeline,dpastling/plethora,dpastling/cnv_pipeline,dpastling/plethora,dpastling/plethora