HYP-301: Adjusting formula for lower and upper bounds
Merge branch 'v3' of https://github.com/stevenweaver/hyphy into v3
Changed the implementation of bounds a bit; most importantly transposed the grammar definition of LOWER [:>] and UPPER [:<] bounds; removed the code that was left over from handling += etc, not relevant for bound operations
Implementse for loops, continue and break statements.
Fixing segfault caused by the unhandled _HY_OPERATION_DEFERRED_FUNCTION_CALL case in _Formula::internalToStr()
Fixing segfault caused by the unhandled _HY_OPERATION_DEFERRED_FUNCTION_CALL case in _Formula::internalToStr()