Include (non-collection) Predecessor/Successor fields in task level reporting

[#1]

Currently, predecessor / successor information is only available as collections to the task object.

This means there is no way to aggregate / matrix / chart on this information.

Include the following (system generated) fields on tasks, so they can be used in reporting:

1. 'hasPredecessors' (boolean)
2. 'hasSuccessors' (boolean)
3. 'Number of Predecessors' (integer)
4. Number of Successors' (integer)
5. 'Predecessor List' (string - Concatenation of predecessorExpression)
6. 'Successor List' (string - equivalent of predecessorExpression for successors).