=====
- Added messages when no file matches the `--obstype` value, by default is
`FOCUS` [9]
- Replaced `parser.error` by `log.error` and `sys.exit` when the directory does
not exist and when exists but is empty.
- Added test for cases when the directory does not exist, when is empty and when
no file matches the selection on `--obstype` which by default is `FOCUS`.
- Replaced `logging.config.dictConfig` by `logging.basicConfig` which fixed
several issues. For instance `--debug` was unusable, and also there were
duplicated log entries for the file handler when used as a library in other
application. [10]
- Replaced the use of the function `get_args` by using arguments on class
instantiation instead
- Created name for modes [11]