Add install and uninstall targets (prettyerr)

diff --git a/ast b/ast
index bf4ca93432d48425ff74496422c577b3ebbd48a2..5d3af4e1897a1da1c9e5eb1ba26711cb46e75829 160000 (submodule)
--- a/ast
+++ b/ast
@@ -1 +1 @@
-Subproject commit bf4ca93432d48425ff74496422c577b3ebbd48a2
+Subproject commit 5d3af4e1897a1da1c9e5eb1ba26711cb46e75829