removed handling of visit events
removed doVisit and related functions from PA loop
Merge remote-tracking branch 'origin/remove-visit-handling' into remove-visit-handling

Conflicts:
	core/post_auction/post_auction_loop.cc
	core/post_auction/post_auction_loop.h
reverted excessive changes
Merge branch 'remove-visit-handling' into pa_loop-events_generalisation
invoke finish() on auctions that are ignored in slow mode
Merge branch 'pa_loop-finish_slowmode_auctions' into pa_loop-events_generalisation