[BZ#641925] Identify svn:externals directories and support re-comparing on them

Submitted by Ame..@...at

Link to original bug (#641925)

Description

when i compare the working directory of a subversion repository to the last committed version, i would like to see all changes, even those done to externals. (it is not possible to commit those in one transaction, but that makes viewing the changes even more important.)

im using meld 1.3.2 from ubuntu 10.10.