Restore commented out tests

This restores the commented out tests (even though they're slow)
and fixes some trailing whitespace.

tests-clar/diff/rename.c

@@ -1334,8 +1334,6 @@ void test_diff_rename__many_files(void)
 	int i, j;
 	git_buf b = GIT_BUF_INIT;
 
-/*
-
 	cl_git_pass(git_repository_index(&index, g_repo));
 
 	for (i = 0; i < 100; i += 1) {
@@ -1354,7 +1352,6 @@ void test_diff_rename__many_files(void)
 	git_index_free(index);
 
 	test_with_many(100);
-*/
 }
 
 void test_diff_rename__again_many_files(void)
@@ -1364,8 +1361,6 @@ void test_diff_rename__again_many_files(void)
 	int i;
 	git_buf b = GIT_BUF_INIT;
 
-/*
-
 	cl_git_pass(git_repository_index(&index, g_repo));
 
 	git_buf_printf(&b, "%08d\n" ANOTHER_POEM "%08d\n" ANOTHER_POEM ANOTHER_POEM, 0, 0);
@@ -1386,5 +1381,4 @@ void test_diff_rename__again_many_files(void)
 	git_index_free(index);
 
 	test_with_many(2500);
-*/
 }