Add a configuration file upgrade script

This isn't ready for distribution but allows users of the -git version
of calcurse to easily update their configuration files without having to
edit them manually.

Following things are still missing here:

* A command line parameter to specify a custom data directory.
* A backup file that is created automatically before upgrading.
* Debug output.

Signed-off-by: Lukas Fleischer <calcurse@cryptocrack.de>

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