Bytecode: various simplifications and modernizations

mex/sources/bytecode/ErrorHandling.hh

mex/sources/bytecode/Evaluate.cc

mex/sources/bytecode/Evaluate.hh

mex/sources/bytecode/Interpreter.cc

mex/sources/bytecode/Interpreter.hh

mex/sources/bytecode/Mem_Mngr.cc

mex/sources/bytecode/Mem_Mngr.hh

mex/sources/bytecode/SparseMatrix.cc

mex/sources/bytecode/SparseMatrix.hh

mex/sources/bytecode/bytecode.cc

preprocessor