C++: Add up/downgrade scripts

Author: igfoo

cpp/downgrades/40e7e591693a6f63fb4c32f12e1c5b2456c6f174/old.dbscheme

@@ -0,0 +1,12 @@
+class SourceFile extends @source_file {
+  string toString() { none() }
+}
+
+class Trap extends @trap {
+  string toString() { none() }
+}
+
+from SourceFile source_file, string name, Trap trap
+where source_file_uses_trap(source_file, trap)
+  and source_file_name(source_file, name)
+select name, trap

cpp/downgrades/40e7e591693a6f63fb4c32f12e1c5b2456c6f174/semmlecode.dbscheme

@@ -0,0 +1,4 @@
+description: Add source_file_name
+compatibility: backwards
+source_file_uses_trap.rel: run source_file_uses_trap.ql
+source_file_name.rel: delete