Bug 722939 - asking for an absolute path as gimpdir results in a path...

...relative to the home folder

If an absolute path was given to the --with-gimpdir configure option,
use that path literally.
Bug 722975 - crash when removing tag from palette while filtering by same tag

Each of the following cleans up tag refcounting, fixes access to
released memory, or other small glitches. Not sure which change
actually fixed the bug:

gimp_data_remove_tag(): remove the found tag, not the passed in tag
(which is to be treated only as a value for comparison).

gimp_tagged_remove_tag(): don't continue the loop after the tag to
remove has been found, there can only be one matching tag, and the
list element has become invalid.

gimptagentry.c: keep references around for the members of
entry->common_tags, and make sure the references are always dropped
properly. In assign_tags(), reference the "add" and "remove" lists for
paranoia and safety reasons.
Bug 723177 - After opening an ICC profile with a long description...

...dialogs are too wide

Ellipsize GimpColorProfileComboBox' label.
Bug 722034 - Incorrect snapping behaviour for scale tool

Always snap to the center of transform tool handles.
Bug 723213 - colors/levels/auto is broken for high bitdepth images

Port gimp_levels_config_stretch_channel() to histograms with
variable number of bins. Still behaves differently for different
bit depths tho.