Test case database now notes which test cases use threads.
New test suite "testansi" consists of test cases that run on the generic ("ANSI") platform.
New target "ansi" builds the MPS with the CONFIG_PF_ANSI CONFIG_THREAD_SINGLE and CONFIG_PROTECTION_NONE settings.
Build and test the "ansi" target as part of "make test" for the benefit of the buildbots (just Linux and FreeBSD for the moment).