Better history implementation. A seperate table is used for history entries. Entries...

Better history implementation. A seperate table is used for history entries. Entries contain the same fields as the memo table except for the message, read, and flags. Entries are only removed from the history db when they get expired by do_expire (older than message_expire). Also fixed up a issue with STATUS. On AfterNET we were getting huge large for the amount of memos. I now realise it was reading the amount of users. It now reads the proper amount of memos. I also a count for history entries.