Added a few lines how to pass global options, just for oblivious
people like me. :-}
"make all" run all tests.
+If you want to set compilation options globally from the commandline,
+use `make EXTRA_HC_OPTS="-foo-option -blah', for global runstdtest options
+use EXTRA_RUNTEST_OPTS.
+
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ADDING A NEW TEST
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