Modified IfLogicBeginBrick.java to support ConcurrentFormulaHashMap
Removed clone method in NestingBrick.java
Modified RepeatBrick.java to support ConcurrentFormulaHashMap
Removed clone method in LoopBeginBrick.java
Modified ConcurrentFormulaHashMap.java clone method
Added/Modified brickClone tests in BrickCloneTest.java to support BrickFields