[bugs] XDG Base Directory Support

Hello,

Has this issue ever been brought up before? If not, could the XDG base dir standard be supported? Not to be confused with allowing an alternative configuration location. Rather, this would usually mean checking for the env var XDG_CONFIG_HOME before falling back to ~/.calcurse.

For reference: https://wiki.archlinux.org/index.php/XDG_Base_Directory

Thanks

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