[Gegl-developer] gegl/gegl documentation patch

[Henrik Akesson]

Here's a patch for:

- Documentation and debug statements added
- Removed needs_visiting from the gegl-visitable interface and the
implementing classes gegl-pad and gegl-node because it was not used
(hardcoded to return TRUE).
- Refactored gegl-eval-mgr field "state" to use an enumeration instead of
integers for improving readability of the code.


/Henrik
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