connect
Description:
Makes a connection between the pads of two nodes, one pad should be a source pad the other a sink pad, order does not matter.
Returns TRUE if the connection was successfully made.
Parameters:
| this | a node | 
| a_pad_name | and the pad of the node we want connected. | 
| b | another node | 
| b_pad_name | and its pad to be connected. |