Replace the existing 'move' tview Page with a new board mode called
'Status Selection'. This mode is used to move cards between statuses.
Resolvesapollo/pelican#11
This PR allows users to specify the path to the database file
Pelican now expects the user to specify the path to the project's
database file which allows users to open different projects.
This is a breaking change because Pelican no longer opens the
default path automatically. If no path is set then Pelican stops
with an error message.
