untab comments in .yml files

[ctb]

when you run --build_config the output file looks like this:

  ####################  Eelpond Pipeline Configfile  ####################

The blank lines are unnecessary, and the '#' starting at column 2 or 3 confuses vim into wanting to start comments and new lines indented.

I'd suggest something like

# 
# eelpond pipeline configuration
# 

but am somewhat agnostic as long as we recognize that whitespace is significant to some editors :)