Added permanent permissions

Finally implemented the permanent permission tables using sqlite3. For
now, performance wasn't a consideration. There are a lot of
optimizations that could be made, like having prepared queries. The code
remains fairly untested.

src/main.c

@@ -38,7 +38,7 @@ int main(int argc, char *argv[]) {
 
   ret = init_ui_socket();
   if (ret != 0) {
-    perror("init_ui_socket");
+    fprintf(stderr, "Could not initalize ui-socket.\n");
     exit(EXIT_FAILURE);
   }