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When setting the unit of a property shared with a gimp_prop_size_entry,
a conversion is applied to the corresponding size property (to preserve
size_entry's ref-value), but the conversion risks to change the size
property already updated.

To update, at the same time, size and unit, it is better to start updating
size_entry's unit in order to trigger the useless conversion on the stale
size.

This makes the different ranges have a clearly different effect,
plus speeds up the gegl op quite a lot.

NOTE: this might affect the result of scripts using color-balance

so they are now GIMP_PDB_ERROR_FOO instead of just GIMP_PDB_FOO,
because it was just too confusing wrt enum GimpPdbStatusType.

calling in a script (gimp-file-load-layer 1 image "notexists.bmp")
used to crash GIMP with the following message:

**
Gimp-PDB:ERROR:gimpprocedure.c:491:gimp_procedure_get_return_values:
code should not be reached
gimp-2.7: terminated: Aborted

Regardless of the elaborate discussion in bug #599267, as soon as the
grid starts covering the image completely (when the is no more spacing
between grid lines), it is entirely useless, so skip drawing it.

Mask intersect fixes for some plug-ins.

Add configuration option for quick mask color.

it was needed for the script version of gimptool which is gone.

Apply heavily modified patch from Es Swartz which adds PDB API for
brush size, angle and aspect ratio, as well as a full interface for
ink. Changed to patch to add all procedures to the "context" group
instead of creating new PDB groups, properly use the new
GimpPDBContext APIs for paint options, and did some general cleanup.
(Warning, completely untested).

(pdb.gimp_item_get_parent(item))

Adjust param conversions when wrapping pdb functions
and implement 'children' and 'parent' getter for
GimpItem Python Object.

so the image's "foo-moved" signals are emitted and the display can
follow. Moving them around manually was needed before the displayed
guides and sample points were proper views of the resp. core objects.