auto-increment project server port if not given #219

Many projects use similar range of ports as pollen's default 8080. It would be friendly behaviour to auto-increment this for say, 10 ports until an empty one was found if 8080 isn't available, rather than die with an error.

Many projects use similar range of ports as pollen's default `8080`. It would be friendly behaviour to auto-increment this for say, 10 ports until an empty one was found if `8080` isn't available, rather than die with an error.

The port is configurational, not discretionary. Therefore it’s better to let the error surface (so that the user can reconfigure).

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auto-increment project server port if not given #219