auto-increment project server port if not given
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).
Deleting a branch is permanent. It CANNOT be undone. Continue?