Disabling the SetLineInformation() macro entirely causes only 3 tests
in the test suite to fail.  Restoring just 2 SetLineInformation() calls
fixes those failures.  The need for all the other SLI() calls is not
demonstrated by any test.  Without more complete test coverage, it is
difficult to confidently tweak the TIP 280 implementation without fear
that changes are introducing breakage.
First additional test.  Remove dup macros in tclEnsemble.c.
Next attempt.  Appears to have uncovered a bug.
Fix for [86fb5ea28e].  Test will eventually merge in from tip280-test-coverage.
merge trunk
Add tests for, and fix bugs in, the SetLineInformation() calls in tclCompCmds.c.
Add tests for SetLineInformation() calls in tclCompCmdsGR.c.
Add tests for SetLineInformation() calls in tclCompCmdsSZ.c as well as some
obvious refactoring improvements.
Add tests for the SetLineInformation() calls in tclEnsemble.c, and fix
the bugs around those calls exposed by the tests.
Revert the revised macros used in developing the new tests.
Add a test for each call to SetLineInformation() demonstrating the need
for it to be there.  Fixed bugs revealed by the new tests.

What's still missing are more tests demonstrating the need for other
SetLineInformation() calls that are not there yet. ;)
merge trunk