The new logging framework is a big step forward, and the current Bro 2.1 ASCII writer gives a lot of meta information to allow unambiguity and script based post-processing.
In addition, I like to have a simplified logging format which I can just open in any spreadsheet program like Excel as a CSV file, i.e. only 1 header row, and no prepending "#fields" entry.
The attached diffs change 3 source files to add an option "only_single_header_row" to the ascii writer to achieve this simplified output.
Please consider to bring it into next release.