new: debug and version macros, cleaning up client/server APIs

examples/pool/main.c

@@ -15,7 +15,6 @@ int main(int argc, char *argv[]) {
 
   lm_ctx_t ctx;
   lm_ctx_init(&ctx);
-  ctx.debug = true;
 
   if (!lm_ctx_set_data(&ctx, DATA_DIR)) {
     printf("failed to set data dir: %s (%d)\n", lm_strerror(), lm_error());
@@ -27,6 +26,8 @@ int main(int argc, char *argv[]) {
     goto end;
   }
 
+  lm_ctx_pools_test(&ctx);
+
   if (!lm_ctx_pools_load(&ctx, true, NULL, NULL)) {
     printf("failed to load pools: %s (%d)\n", lm_strerror(), lm_error());
     goto end;