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.