ControlFlowException can always have a null cause
Documentation and more refactoring of Simple Language

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rename : graal/com.oracle.truffle.sl/src/com/oracle/truffle/sl/builtins/SLTimeBuiltin.java => graal/com.oracle.truffle.sl/src/com/oracle/truffle/sl/builtins/SLNanoTimeBuiltin.java
rename : graal/com.oracle.truffle.sl/src/com/oracle/truffle/sl/builtins/SLPrintBuiltin.java => graal/com.oracle.truffle.sl/src/com/oracle/truffle/sl/builtins/SLPrintlnBuiltin.java
rename : graal/com.oracle.truffle.sl/src/com/oracle/truffle/sl/nodes/call/SLUninitializedCallNode.java => graal/com.oracle.truffle.sl/src/com/oracle/truffle/sl/nodes/call/SLUninitializedDispatchNode.java
rename : graal/com.oracle.truffle.sl/src/com/oracle/truffle/sl/nodes/local/ReadLocalNode.java => graal/com.oracle.truffle.sl/src/com/oracle/truffle/sl/nodes/local/SLReadLocalVariableNode.java
rename : graal/com.oracle.truffle.sl/src/com/oracle/truffle/sl/nodes/local/WriteLocalNode.java => graal/com.oracle.truffle.sl/src/com/oracle/truffle/sl/nodes/local/SLWriteLocalVariableNode.java
address issue in Eclipse working set generation

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extra : amend_source : 0ce861f5bccd0d69f27981d356714ede9d0c79f5
fixed Linux compile error and removed name of not-yet-existing Windows Okra dll
fixed HotSpotResolvedJavaField.getModifiers() to mask out FIELD_INTERNAL_FLAG
merge