cleanup

...c/main/java/com/google/simplecfg/ExtendJAnalyzerMain.java

simplecfg/src/main/java/com/google/simplecfg/PrintCfg.java

...cfg/src/main/java/com/google/simplecfg/TestGenerator.java

...src/test/java/com/google/simplecfg/AlreadyClosedTest.java

...st/java/com/google/simplecfg/NullableDereferenceTest.java

...lecfg/src/test/java/com/google/simplecfg/StmtCfgTest.java

...g/src/test/java/org/extendj/ast/IdentityTupleSetTest.java

simplecfg/testdata/AlreadyClosedControlFlow01.javax

simplecfg/testdata/AlreadyClosedNegativeFindings01.javax

simplecfg/testdata/AlreadyClosedWriter01.javax

simplecfg/testdata/Close01.javax

simplecfg/testdata/ConditionalExpr01.javax

simplecfg/testdata/DoStmt01.javax

simplecfg/testdata/DoStmt02.javax

simplecfg/testdata/EnhancedFor01.javax

simplecfg/testdata/Filtering01.javax

simplecfg/testdata/ForStmt01.javax

simplecfg/testdata/ForStmt02.javax

simplecfg/testdata/ForStmt03.javax

simplecfg/testdata/ForStmt04.javax