removed handleConv; refactored handleProj to replaceProj
replaceGeneric now uses firm Node wrapper class more consistently, also allows replacing nodes of mode Lu,Is and Bu
Updated updateTarvalForArithmeticNode to include tarval optimizations for add, sub, mul, div and mod
Merge branch 'dev' of https://github.com/djrieger/mjplusplus into dev

Conflicts:
	src/firm_interface/ConstantFolder.cpp
	src/firm_interface/Tarval.hpp
generated documentation