Test run quantization.

Also rename run_quantize_*() to improve clarity.  These tests
demonstrate that run_quantize_ceil() is flawed.
diff --git a/Makefile.in b/Makefile.in
index a4555c0..f60823f 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -159,6 +159,7 @@
 	$(srcroot)test/unit/quarantine.c \
 	$(srcroot)test/unit/rb.c \
 	$(srcroot)test/unit/rtree.c \
+	$(srcroot)test/unit/run_quantize.c \
 	$(srcroot)test/unit/SFMT.c \
 	$(srcroot)test/unit/size_classes.c \
 	$(srcroot)test/unit/smoothstep.c \