Debugger: Fix handling of team_id clashes.

TeamDebugger:
- Add accessor to query whether the debugger's interface is a post mortem core
  rather than a live team.

TargetHostInterface:
- When asked to locate a team debugger by team_id, as is done for attach
  requests to determine if we already have an existing instance attached, skip
  over post mortems. This takes care of the potential problem of detecting a
  core instance with the same team_id as a live team, and consequently refusing
  the attach request.
- When a team debugger quits, use its actual pointer to look it up rather than its
  team ID, as we could otherwise potentially remove the wrong one in the case of a
  clash.

src/apps/debugger/controllers/TeamDebugger.cpp

@@ -218,6 +218,7 @@ TeamDebugger::TeamDebugger(Listener* listener, UserInterface* userInterface,
 	fSettingsManager(settingsManager),
 	fTeam(NULL),
 	fTeamID(-1),
+	fIsPostMortem(false),
 	fImageHandlers(NULL),
 	fImageInfoPendingThreads(NULL),
 	fDebuggerInterface(NULL),
@@ -337,6 +338,7 @@ TeamDebugger::Init(DebuggerInterface* interface, thread_id threadID, int argc,
 	fDebuggerInterface = interface;
 	fDebuggerInterface->AcquireReference();
 	fTeamID = interface->TeamID();
+	fIsPostMortem = interface->IsPostMortem();
 
 
 	// create file manager