Remove some obsolete test files. Fix up the name of the command-line clienttests directory in places that were missed when it was changed in r17718.Correct some information in the tests README file.* INSTALL* build/win32/vc6-build.bat.in Fix up the name of the command-line client tests directory.* subversion/tests/README Fix up file and dir names and remove reference to an obsolete XML dir.* subversion/tests/cmdline/xmltests* subversion/tests/cmdline/xmltests/svn-test.sh* subversion/tests/cmdline/xmltests/svn-test2.sh Delete, as these tests are obsolete.