Add display of tree content w/ui-tree.c

Signed-off-by: Lars Hjemli <hjemli@gmail.com>
diff --git a/cgit.h b/cgit.h
index c9554a7..2fdfab3 100644
--- a/cgit.h
+++ b/cgit.h
@@ -83,5 +83,6 @@
 extern void cgit_print_summary();
 extern void cgit_print_log(const char *tip, int ofs, int cnt);
 extern void cgit_print_view(char *hex);
+extern void cgit_print_tree(const char *sha1);
 
 #endif /* CGIT_H */