where _ANY_ mention of com.sun.tools.javac.tree.TreeMaker,
anywhere in a source file, would disable pretty much every
intelligent part of what makes the 'I' in IDE in eclipse:
No auto-complete, no 'go to declaration', etcetera, but only
since Eclipse Juno (not fixed in Kepler either). It's the
presence of src/stubs/com/sun/tools/javac/util/Context.java.

I've moved Context to a special stubs directory that's only used
for javac (so that we still get the benefit of getting some
warnings and such when making command line builds), and removed
the @Override annotations for where the stubbing is relevant
(for methods that exist in javac7 but not in javac6 on interfaces
we create implementations of). Furthermore, I did some extremely
tricky work in making our version actuall compatible with the
exact class signatures of both javac6- and javac7+'s versions;
generation of synthetic methods for reified type parameters was
causing havoc.

A big stack of 'here be voodoo' comments unfortunately added to
explain it all; necessary evil.