enable node/link deletion

[charlesdaniels]

low pri, as there is no obvious use case at this time...

It should be possible to delete nodes and links. This should be exposed via the TCL API.

To delete a node:

1. de-allocate internal buffer
   • warn/error if there are flits still left in it?
2. delete nocsim_node* entry from state->nodes
3. (GUI only) de-allocate corresponding graph node from AG_Graph
   • AG_GraphFindNode()
   • may not be possible to delete a node at run-time, so instead the node could be hidden and have it's userPtr cleared to NULL
4. De-allocate node structure.

To delete a link (may change once #6 is done):

1. Clear the link pointer from the incoming and outgoing lists on the two endpoint nodes
2. (GUI only) de-allocate corresponding graph edge from AG_Graph
   • Same caveats apply as with nodes.
3. De-allocate the link structure.