to_csv turns a placefile into a csv file.
usage: to_csv [options] placefile[s]
| -o | Specify the filename to write to. |
| --out-dir | Specify the directory to write files to. |
| --prefix | Specify a string to be prepended to filenames. |
| --no-csv | Output the results as a padded matrix instead of csv. |
| --point-mass | Treat every pquery as a point mass concentrated on the highest-weight placement. |
| --pp | Use posterior probability for the weight. |