===== list_config =====
----
Prints a brief list of all configurations in a potfit config file.

<code>
usage: list_config [-h] filename

Prints a brief list of all configurations in a potfit config file.

positional arguments:
  filename    name of the potfit config file

optional arguments:
  -h, --help  show this help message and exit
</code>

Scans a //potfit// configuration file and lists all configurations found. 
This includes the origin (if comment is found), the starting line, number of atoms and 
weight of the configuration.