Make svn changelist --remove's performance relative to the size of the target tree instead of relative to the number of ACTUAL records.
* subversion/libsvn_wc/wc-queries.sql (STMT_DELETE_ACTUAL_EMPTIES): Just delete unneeded ACTUAL nodes within reach of the operation instead of globally to avoid a table scan.
* subversion/libsvn_wc/wc_db.c (set_changelist_txn): Pass local_relpath to sql query.
* subversion/tests/libsvn_wc/wc-queries-test.c (slow_statements): Remove the last 'need review' item.