- tests/*: marked with deferable and optional runtest flags. Some
moving around of tests within different sections to more closely
align with the guide.
- runtest.py has --deferable/--no-deferable and
--optional/--no-optional to control whether tests marked as
deferable and optional are tested.
- Makefile: DEFERABLE and OPTIONAL top level flags to be passed to
runtest when running tests.
- Also, fix problems in java quoting revealed by step7 test changes.
1. `gensym` isn't yet available in step8
2. `and` tests are very slow in some implementations
3. ->> macro is more complex
4. moved core.mal to the end so it won't override the builtin `or` macro
