read.cross.mq: strip off trailing '/' in directory name
Refactor read.cross.mq.map; handle comments at the top
refactor read.cross.mq.loc; a bit faster and more flexible
Refactor read.cross.mq.qua, much as I did to read.cross.mq.loc
Mention read.cross.mq changes in STATUS, and in BUG report that it's fixed