[svn] * src/log.c,src/log.h: Add Log_fatal() for reporting fatal errors and exiting, Log_gdbm_fatal() for the the same but specifically as a GDBM error reporting function, and a new log debug level AUTH for a forthcoming authentication mechanism. * src/database.c,src/group.c: Provide new gdbm error function to all gdbm opens. * src/noffle.c: Add atexit() to always close databases on a program- inspired exit. * src/content.c,src/dynamicstring.c,src/fetchlist.c,src/filter.c, src/itemlist.c,src/log.c,src/log.h,src/over.c,src/protocol.h, src/request.c,src/util.c: Use Log_fatal where appropriate.