Make collate counts output more machine readable

Otherwise prints columns padded with spaces, which
might be more of a pain to parse later on

bin/collate_counts.py

@@ -8,6 +8,8 @@
 Portability : POSIX
 '''
 import pandas as pd
+import sys
+from io import StringIO
 from natsort import index_natsorted, order_by_index
 from argparse import ArgumentParser
 
@@ -45,7 +47,12 @@ def main():
 
  new_index = order_by_index(result_df.index, index_natsorted(df['guide']))
  result_df = result_df.reindex(index=new_index)
- print(result_df.to_string(index=False))
+
+ # write to stdout
+ output = StringIO()
+ result_df.to_csv(output, sep='\t', index=False)
+ output.seek(0)
+ print(output.read(), file=sys.stdout)
 
 
 if __name__ == "__main__":