[misc] -C, --conf option

Hi–

When I run `calcurse --help` (most recent git master), there are these
options:

...
  -C, --conf <path>       Specify the configuration path to use
  --daemon                Run notification daemon in the background
  -D, --directory <path>  Specify the data directory to use
...

The option -C, or --conf, is not in the manpage, did not exist before
(4.3.0 release), and I am not sure what it is supposed do.  Is it for
debugging purposes?  Or will it replace -D?

—Marco

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