changesets: Reviewed and fixed.
- Unified parameter names. - Added some missing allocation checks. - Fixed changesets_empty() (was giving wrong answer if there were more changesets and the last one was empty). - add_soa() now returns error code. Neede for parameter checking. - changeset_merge() should not change the second changeset. - Removed unused changesets_clear(). - Removed unused flags from changesets_t. - Fixed doxygen comments.
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