Makefiles: update tests to ignore the BareExcept warning.

The `unittest` library still contains a number of bare exceptions, which
now result in warnings from the compliler. Patching the standard library
to remove these warnings is outside the scope of this project, so we're
going to ignore these warnings.

Makefile

@@ -5,25 +5,22 @@ SOURCES=$(call rwildcard,src/,*.nim)
 TEST_SOURCES=$(wildcard tests/*.nim)
 TESTS=$(patsubst %.nim,bin/%,$(TEST_SOURCES))
 
-.PHONY: test
-test: $(TESTS) $(SOURCES)
-	@for t in $(TESTS); do $$t; done
-
-.PHONY: watch-tests
-watch-tests:
-	watch 'make test' src tests --wait=10
-
 .PHONY: build
 build: test
 	nimble build
 
+.PHONY: test
+test:
+	#@for t in $(TESTS); do $$t; done
+	nimble --warning:BareExcept:off test
+
 .PHONY: install
 install: test
 	nimble install
 
-diagrams: doc/vcard3.mmd doc/vcard4.mmd
+diagrams: doc/vcard3.mmd
 	mmdc -i doc/vcard3.mmd -o doc/vcard3.png
-	mmdc -i doc/vcard4.mmd -o doc/vcard4.png
 
+# Target allowing for running individual tests.
 bin/tests/%: tests/%.nim $(SOURCES)
-	nim --outdir:bin/tests c $(patsubst bin/%,%.nim,$@)
+	nim --outdir:bin/tests --hints:off --warning:BareExcept:off c -r $(patsubst bin/%,%.nim,$@)