Regression on a number of tidy tests

[geoffmcl]

Running the alltest.cmd showed a number of tests now exited with a different error level due to the suppression of some warnings.

[geoffmcl]

This was fixed by changing the showingBodyOnly() function to a macro which only returns yes if TidyBodyOnly == TidyYesState.

Thus the warnings are still issued if the config --show-body-only yes is not set, passing the tests, but still suppressible if desired.