svn path=/main/trunk/; revision=11134
"""
The uninstall is performed only after blocking packages have been
merged on top of it (similar to how a normal upgrade is performed
- by first merging the new version on top of the onld version). This
- is implemented by reversing the the parent -> uninstall edges in
+ by first merging the new version on top of the old version). This
+ is implemented by reversing the parent -> uninstall edges in
the graph.
"""