Specified sizes in bytes in dbStats.txt and fixed incorrect parameter in program/mongo.txt

The main goal of this pull request is specify that the sizes from dbStats are in bytes.  Currently the measure of size is not  specified, making it unclear whether it is in bytes or bits.

It seems I had an old commit hanging around that fixed a line in program/mongo.txt that had an invalid argument.  Hostname is not a real argument for mongo, but host is.  Sorry for smashing these 2 changes together, if its a big issue I can split them out.