Rough cut of "Move tasks to column..."
Add a "Move tasks to column..." action to workboards which moves all visible tasks in a column to another column, either on the same board or on a different board.
- The first dialog asks you to choose a project, defaulting ot the current project.
- The second dialog asks you to choose a column on that project's board.
- Moved tasks on the same board.
- Moved tasks to a different board.
- Tried to move tasks to the starting column, got a sensible error.
- Tried to move tasks to no project, got a sensible error.
Reviewed By: amckinley
Maniphest Tasks: T5523
Differential Revision: https://secure.phabricator.com/D18665