Includes the following change:
* When replacing a package that is going to be updated in the transaction
do not remove it, just overwrite its files and continue. The updated
package will find that old files didn't match the SHA256 hash and will
skip them. This solves the issue of new package updates requiring new
dependencies with files that were previously stored in the old version.
For example gtk+-2.20 containing gdk-pixbuf, and gtk+-2.22 requiring
gdk-pixbuf externally.
8534b79ffc