Refactor and optimize .config generation

 - Use the nifty writelines() function, which I had completely missed.
   Saves creating a large temporary string for each .config (though it's
   probably not a big deal). Since writelines() doesn't add any
   newlines, tweak the string literals to add them.

 - Get rid of _make_block_conf(). This helper made more sense in ancient
   versions where there was a separate _Block class.

 - Rename _make_conf() to _add_config_strings() to be a bit more
   explicit.

 - Also rename the 'append_fn' parameter to 'add_fn'.

 - Misc. minor nits.

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