Peak Mem column in the profile page displays 0 when value is less than 1MB

git.commit.id=4d398edf87d2ec6fab6c552b1f5a33fb31b955bc

For the "Peak Mem" column in the Query and Planning page, the value is displayed as 0 when the actual value is less than 1MB. We should display more granular value for this especially for smaller jobs; maybe display up to 2 or 3 digits after the decimal.