Update for Ceylon 1.1 (typechecker version)
Remove workaround for ceylon/ceylon-compiler#1589
Lazily create Writers for files

It shouldn’t make any difference for normal users, but it was really
annoying that you couldn’t debug dogfooding because the creation of the
Overwriters would immediately wipe the source file, which Eclipse then
showed.
Implement TypeConstraintLists for methods
Don’t always apply return’s indentAfter