Adds a simulation_profile to GimpImage to allow plug-ins to access it
for CMYK import/export.
Two pdb functions were added to enable this access:
image_get_simulation_profile () and image_set_simulation_profile()
Next, it updates menu options and code to support GimpImage's
internal simulation profile. Menu items are moved from View to Image's
Color Management section.
New 'simulation-profile-changed' signal is emitted via
GimpColorManagedInterface so that relevant tools (such as the
CYMK color picker, GimpColorFrame, and future dockable
dialogue) are aware of these changes.
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