fix a lot of memory leaks that were exposed by unit tests.

src/kernel/build.c

@@ -991,6 +991,7 @@ void free_construction(struct construction *cons)
 {
     while (cons) {
         construction *next = cons->improvement;
+        free(cons->name);
         free(cons->materials);
         free(cons);
         cons = next;

src/kernel/item.c

@@ -517,6 +517,7 @@ static int icache_size;
 #define ICACHE_MAX 100
 
 void item_done(void) {
+    icache_size = ICACHE_MAX;
     i_freeall(&icache);
     icache_size = 0;
 }
@@ -951,7 +952,7 @@ void write_items(struct storage *store, item * ilist)
 
 static void free_itype(item_type *itype) {
     assert(itype);
-    free(itype->construction);
+    free_construction(itype->construction);
     free(itype->_appearance[0]);
     free(itype->_appearance[1]);
     free(itype);

src/tests.test.c

@@ -27,11 +27,12 @@ static void test_resources(CuTest *tc) {
     rtype = rt_get_or_create("stone");
     CuAssertPtrEquals(tc, (void *)rtype, (void *)rt_find("stone"));
     CuAssertPtrEquals(tc, (void *)rtype, (void *)get_resourcetype(R_STONE));
-    test_cleanup();
+    free_resources();
     CuAssertPtrEquals(tc, 0, rt_find("stone"));
     CuAssertPtrEquals(tc, 0, rt_find("peasant"));
     rtype = rt_get_or_create("stone");
     CuAssertPtrEquals(tc, (void *)rtype, (void *)get_resourcetype(R_STONE));
+    test_cleanup();
 }
 
 CuSuite *get_tests_suite(void)

src/util/message.test.c

@@ -9,6 +9,7 @@ static void test_mt_new(CuTest *tc)
     message_type *mt;
     test_setup();
     mt = mt_new_va("test", "name:string", "number:int", NULL);
+    mt_register(mt);
     CuAssertPtrNotNull(tc, mt);
     CuAssertStrEquals(tc, "test", mt->name);
     CuAssertIntEquals(tc, 2, mt->nparameters);