* Make it clearer that fixture names are distinct from test case names.
* Mention -FS, -FC and -FA ctest command line options for overriding
fixture behavior.
Fixes: #17141
When this property is set, the test is skipped and its status is
automatically set to 'Not Run'. A disabled test will not be counted in
the total number of tests and its completion status will be 'Disabled'.
Add new test properties:
* FIXTURES_SETUP
* FIXTURES_CLEANUP
* FIXTURES_REQUIRED
to specify the roles and dependencies of tests providing/using
test fixtures.