Without this patch the resource whole_line would be included in the
stable stdlib module shipping in PE 1.2. Ideally the name will be
stable and unchanging in the future.
There was quite a bit of concern over whole_line being an unwise name.
file_line appears to be the most suitable name and least likely to need
another rename in the future.
This commit adds a native type that can check if
a line exists and append it to a file.
This use case seems common enough to warrant its
inclusion into stdlib.
Reviewed-by: Jeff McCune