Rename aggregate members to constituents

src/sql/hydra.sql

@@ -514,10 +514,10 @@ create table NewsItems (
 );
 
 
-create table AggregateMembers (
+create table AggregateConstituents (
     aggregate     integer not null references Builds(id) on delete cascade,
-    member        integer not null references Builds(id) on delete cascade,
-    primary key   (aggregate, member)
+    constituent   integer not null references Builds(id) on delete cascade,
+    primary key   (aggregate, constituent)
 );