Balancing and event subscription for connections #4

To use existing connections for event and balancing subscriptions a new set of API funtions is required.

Current API:
tml_Evt_Send_SubscriptionRequest
tml_Evt_Send_UnsubscriptionRequest

tml_Bal_Send_SubscriptionRequest
tml_Bal_Send_UnsubscriptionRequest

New API:

TML_INT32 tml_Conn_Bal/Evt_Send_...(TML_CONN_HANDLE hconn, const TML_CTSTR *sprofile)