[Omake] Files in subdirs

[Chris Campbell]

Thanks Jason.

For the curious, the OMakefile now looks like this...

TEST_MAIN = unit-tests

TEST_FILES = testUtils oUExt \
	maths/testD3Matrix maths/testD3Transformation \
		maths/testMaths

.PHONY: clean
clean:
	$(CLEAN) $(TEST_MAIN)

OCAMLINCLUDES += .. # for OUExt.ml

.SUBDIRS: maths
	*.ml, *.mli : $(EMPTY)

OCAMLINCLUDES += maths

.DEFAULT:$(OCamlProgram $(TEST_MAIN), $(TEST_FILES))