Picked up changes from viewer-maint-2287

Adaptation of current merchant outbox project viewer to conform to Singularity's needs.

Adds the following commits by Merov Linden:
a5db366 MAINT-2287 : WIP : Implement a market place state
43fc74b MAINT-2287 : WIP : Fix compile issue
cb887fe MAINT-2287 : Fixed : Test the merchant/no merchant status without relying on outbox, Recreate missing outbox for a merchant, UI clean up on init.
f1934c0 MAINT-2301 : WIP : Catch a bit more 4xx and 5xx error codes, display the error code in the alert.
3fbbe6c MAINT-2301 : Fixed : Ignoring 499 timeout errors on POST (safe).
3dc6263 MAINT-2301 : Do not treat 404 errors (server returns not found) as 403 errors (forbidden, i.e. resident is not a merchant)
94039ee MAINT-2301 : Change messaging in the Merchant Outbox panel when an error happened, so not to be confused with the not-a-merchant case.
7c9cb2e MAINT-2452 : Fixed : Do not clear the cookie in IMPORT_DONE_WITH_ERRORS case so future retry have a chance to work.
67b872e WENG-618   : Added debug printout for POST and GET when InventoryOutboxLogging is turned on

Translators, you will need to update strings.xml and notifications.xml for this change.

indra/newview/llfloateroutbox.h

@@ -55,7 +55,7 @@ public:
 	LLFloaterOutbox(const LLSD& key);
 	~LLFloaterOutbox();
 
-	void setupOutbox(const LLUUID& outboxId);
+	void initializeMarketPlace();
 
 	// virtuals
 	BOOL postBuild();
@@ -71,6 +71,7 @@ public:
 //	void onMouseLeave(S32 x, S32 y, MASK mask);
 
 protected:
+	void setupOutbox();
 	void fetchOutboxContents();
 
 	void importReportResults(U32 status, const LLSD& content);