Fix bug where we used an unbound local variable if we ended up rolling back the persist_event transaction

Killed an unexpected pagination trigger when the page load: paginateMore

Do this by synchronizing the m.room.member joined event from the events stream and the start of the pagination

Removed historical code: recents does not need to manage presences. It is already done by initialSync in eventStreamService

Fixed bug which displayed an older room topic because it was being returned from /initialSync messages key. Check the ts of the event before clobbering state.

Don't autogen config in synctl for the same reasons we don't turn of --generate-config by default on the homeserver - it is liable to confuse people who have moved the config file or have chosen a non standard location.

Also, don't override log file location.