Refactor to clarify implementation of `save`

The `save` method was previously relying on some really
specific implementation details of the `section` class
(when the start/end_line would be nil, etc.).  This made
the code a bit hard to follow.

This commit introduces a few utility methods in the
`section` class (`is_new_section?`, `is_global?`), and
refactors the `save` method to use them... this makes
the logic a little easier to follow and should hopefully
make it easier to maintain.

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