Add TRP handling events, plus change to cfg layout.

Add TRP handling events, plus change to cfg layout.

The main purpose of this commit is to add a stub for TRP event handling.
This currently amounts to listning to a TCP port and replying with a
brief message. Additionally, moved the active and new configurations
in the TR_INSTANCE struct into a container called TR_CFG_MGR. Other
instance types (TIDS, TRPS [new with this commit], and CFGWATCH)
instances now refer to the TR_CFG_MGR rather than to the TR_INSTANCE.
This resolves circular include dependencies and makes for a cycle-free
object hierarchy. Finally, introduced more complete use of talloc
for memory management, though this is probably not complete yet.