Slim result of NewTag and correct cache iterators.

diff --git a/apt b/apt
index c2fb49ca1783b9ea2dd8b7cb90a2284750076c65..c7db7b2f8740c8c1ad859e9ad8f426fe601b5f04 160000 (submodule)
--- a/apt
+++ b/apt
@@ -1 +1 @@
-Subproject commit c2fb49ca1783b9ea2dd8b7cb90a2284750076c65
+Subproject commit c7db7b2f8740c8c1ad859e9ad8f426fe601b5f04