projman #3418 add deliverables to description of tasks [open]

add a new entity <deliverable> to the description of tasks, so that in the end one can get a table of all deliverables and dates at which they will become available. Is a deliverable a type of milestone by the way ?

priorityimportant
typeenhancement
done in0.17.0
load1.000
load left1.000
closed by<not specified>