Add idea: Incremental tests: only run tests that were updated

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+- Incremental tests: only run tests that were updated [idea]
+
+  If a test is more than an executable, then tracking its "inputs" (so that we
+  know whether to run it) will be tricky. Such a test will most likely run via
+  testscript so can we capture inputs somehow? This seems to be related to the
+  question of what to attach testscripts to. Maybe we should make them (in
+  source) targets?
+
+  Will also need some kind of switch/override to run all tests (command line
+  config override seems like a natural choice).