toolkit: sal_Bool -> bool

Change-Id: I8819d408e8556bbf38605c2feef2fa87d8dd41c3
Keep files of failing tests around

(Arguably, such files should be stored in a workdir/CppunitTest/... directory
removed and freshly created before every test run, instead of in TMPDIR.)

Change-Id: I12e5073f4e8098cfd99456101fbc2d6ab919f093
Partial revert of e910705421b40f3accff684e956854ff68761574

"Use Any.get<T>(..) instead of Any.getValue(..) and ugly cast."  An empty
OString means a different thing than a char* nullptr to
FastSerializerHelper::startElementNS.  Broke CppunitTest_sd_export_tests at
least --with-export-validation.

Change-Id: I4ad23c4130bf39708064569b964bcb7fb44cd3b0