PIT CLI
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* Added an option, `-e`, to filter by extended properties and its complement,
`-E`, to set extended properties. Format of the option argument is
`<propName>=<propValue>`.
* Added the `--title` and `--text` options to specify the title and text of an
issue on the command line.
* When a new issue is created or an issue is set to rejected or resolved status
a timestamp is added as an extended property: `created`, `rejected`, and
`resolved` are the property names respectively.