Tell people who pass mixed target types to 'svn diff' synopsis 1 that they
are probably looking for one of the '--old X --new Y' invocations.
Suggested by: Alexey Neyman
* subversion/svn/diff-cmd.c
(svn_cl__diff): Wrap the error from svn_cl__assert_homogeneous_target_type()
with a somewhat verbose but informative message.
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subversion/trunk/subversion/svn/diff-cmd.c