moved them to tests dir
	renamed:    broom/core_test.brm -> tests/core_test.brm
	renamed:    broom/recur.brm -> tests/recur.brm
    t option for testing.
    separated files for tests.
	modified:   broom/core.brm
	modified:   main.go
	modified:   tests/core_test.brm
	modified:   tests/recur.brm
some implementations with recur.
	modified:   broom/core.brm
	modified:   tests/core_test.brm