	* Fixes a terrible mistake by my side that could cause SIGSEV's in some situations, I was incorrectly unref'ing the outbox folder 	* Replaced a tny_folder_sync by the async version
	* Fixes a terrible mistake by my side that could cause SIGSEV's in some situations, I was incorrectly unref'ing the outbox folder
	* Replaced a tny_folder_sync by the async version

pmo-trunk-r4175

community-ssu/modest,community-ssu/modest,community-ssu/modest,community-ssu/modest