Actions can only be moved around the Diagram, not onto any other package
members.
Dragging a file group onto an action will now provide the output of
connecting the file group into an output slot. (however, the arrows will
not yet be drawn).
Implement the drawing of connection arrows from actions out to file
groups.
Draw the slot's name alongside the connector arrow.
Allow double-clicking on slot names, rather than single-clicking
followed by "OK".
By default, create a "Main" package in every build.bml file. This is
non-deletable and will appear as the default editor when a build.bml
file is first opened.