import-checker: refactor source reading
This will allow .t files to generate multiple sources.
It will also allow .py doctests to generate additional sources.
# See http://EditorConfig.org for the specification
root = true
[*.py]
indent_size = 4
indent_style = space
trim_trailing_whitespace = true
[*.{c,h}]
indent_size = 8
indent_style = tab
trim_trailing_whitespace = true