tentative robustification of WP output

tests/bugs/oracle/issue11.res.oracle

tests/bugs/oracle/issue23.res.oracle

tests/bugs/oracle/issue24.res.oracle

tests/bugs/oracle/issue27-pred.res.oracle

tests/bugs/oracle/logiccast.res.oracle

tests/bugs/oracle/term.res.oracle

tests/bugs/test_config

tests/da/test_config

tests/ppwp/oracle/expand.res.oracle

tests/ppwp/oracle/expandf.res.oracle

tests/ppwp/oracle/simple.res.oracle

tests/ppwp/oracle/z.res.oracle

tests/ppwp/test_config

tests/specs/wp_empty_struct.cpp

tests/test_config

tests/wp-cache/cache/2457e9e3ceffadd99affa2bac5b00701.json

tests/wp-cache/cache/4825227cab959df9b11836e5a86b9400.json

tests/wp-cache/cache/700a49708dbbfb8a3d11c4175ff16350.json

tests/wp-cache/cache/8a114a0d4786d3d300536602a4e51312.json

tests/wp-cache/cache/bbde3b8fa9c480d2796fc88f6c7828a2.json