Rates on the most popular mortgage loans -- those with fixed rates -- moved up slightly this week but remained near historic lows, Freddie Mac said in releasing the results of its latest Primary Mortgage Market Survey.Rates on 30-year fixed-rate mortgage averaged 3.41 percent with an average 0.7 point for the week ending Oct. 25, up from 3.37 percent last week but down from 4.1 percent a year ago. Rates for 30-year fixed-rate loans hit an all-time low in Freddie Mac records dating to 1971 of 3.36 percent during the week ending Oct. 4.For 15-year fixed-rate loans, rates averaged 2.72 percent with an average 0.6 point, up from 2.66 percent last week but down from 3.38 percent a year ago. Last week's average for 15-year fixed-rate loans was an all-time low in Freddie Mac records dating to 199...