Issue #1586: Symtab: Add c.l.Error to the symbol table (#1586).
Issue #1586:
AbstractModelLoader: Change the model loader for exception types
AbstractTransformer: Don't erase to j.l.Error or j.l.Exception when extending and instantiating.
We no longer need the extra parameter about the @Overrides-ness of getType() method.
Issue #1586: AbstractModelLoader: Special case for setting the uncheckedNullType-ness of exception messages -- maybe @FroMage can see a nicer way to achieve this.
Issue #1586: Add a test for the uncheckedNullType-ness of exception messages.
Issue #1586: Add a test and update tests for the non-erasure of exception types in extends clauses and at instantiations.
Issue #1586: Update tests now that j.l.Error and j.l.Exception are not importable.
Issue #1588: Add a test
Fix #1588
revocery: Add a test for omitted parens in a class ExtendedType InvocationExpression.
revocery: Fix bug with omitted parens in a class ExtendedType InvocationExpression.
Comment typo
Issue #1586: Rewrite the test for subclasses of Throwable following feedback from @FroMage.
Fixed #924 build completely broken
Fixes CCE for #1587 , although the actual problem was because we've made binary incompatible changes to the compiler with respect to the modules on Herd
Symtab #162: Added new model annotations

LocalDeclaration declares a qualifier for a local declaration
LocalDeclarations lists the java local classes that are contained in a given class (can be
 a Ceylon class or a getter/method that requires a Java class)
LocalContainer specifies where a local interface belongs because we pull them to toplevel
Setter allows us to find a corresponding getter class from a setter java class
ClassWriter #162: Generate valid type signatures for local types

This appears to be a Javac bug, I reported it upstream
AbstractTransformer #162: Use our own ProducedTypeNamePrinter to print local names with qualifiers
HasTypeVisitor #162: visitor which tells us if a tree contains a non-alias ClassOrInterface or ObjectDefinition
LocalTypeVisitor #162: visitor which collects all the local Java class names contained in a ceylon tree
CeylonEnter #162: Run most visitors in the same loop