Constraints are not easy to notice. They are only visible when you edit the
date fields of a task from the Task View.  I've been caught out wondering
why a task wasn't moving because I had a constraint defined - quite
confusing so it should be changed.

Suggest initially that this is shown clearly on the Edit dialog for a task. 
Usually constraints are fine-tuned per-task and thus in the edit dialog is
the best location.

Should be on the first page of the Edit dialog at the top near/under the
Milestone /Work stuff. Should have a Constraint and a date/time picker.

It should also ideally be obviously flagged on the gantt and task views but
thats a later change (say a column with a text field of the constraint ?.

Rgds,
Lincoln.

ps: I should be able to do the dialog on this one next.