Comment out non-data lines in the output files

[MatthewWhiting]

In the ASCII output catalogue (and logfile, perhaps), it would be worth adding a # character to the start of all lines that don't form part of the data table. This includes all the parameters, the description of the noise and stats, and the table headers.

This would enable the output file to be directly parsed by various readers (eg. python).

[MatthewWhiting]

Done (largely) in [1137].

Need to have another look at the cube summary - may want to write this to a binary file anyway and remove it from the logfile. But generally speaking all things that are comments/metadata are commented out with a #.

[MatthewWhiting]

Set to low priority, as want to address the log file, but this is essentially closed.

[MatthewWhiting]

This is essentially done, now that we've moved the cube summary out of the log file (#181). [1147] comments out the last line, so we seem to be clear.

Closing ticket.