Rename "builtin config file" to "default config file".
Better explain the use of the additional config files (use "-t <port>.cfg -C <config.file>"
instead of "-C <config.file>").
fix copy'n'paste error
Merge pull request #77 from groessler/gh-pages_to_pull

Rename "builtin config file" to "default config file".
Merge remote-tracking branch 'upstream/gh-pages' into gh-pages-sgml