Use proper last_id files when syncing chats and when restoring chats#224

Merged

gaubert merged 2 commits intogaubert:masterfrom

Sep 14, 2015

Commits on Sep 6, 2015

When syncing chats, save last_id to the proper file "chat_last_id"
adept
committed
Record progress of chat restore in the proper file, without clobbering
adept
committed