- Adds Node >> isReferenced to avoid unneeded aliasing
- Better implementation of VariableNode >> isImmutable
- Adds IRASTTranslator >> visitOrAlias: and also alias inside BlockSequenceNode,
  fixing issue #704

- Recompiles all JS files
- Helios: Use the environment's doIt receiver for doIts.
Better formatting of Counter >> renderOn:
Merge branch 'master' of github.com:amber-smalltalk/amber