add compare capability to tuple and variant

alib2data/src/automaton/FSM/DFA.cpp

alib2data/src/automaton/FSM/EpsilonNFA.cpp

alib2data/src/automaton/FSM/ExtendedNFA.cpp

alib2data/src/automaton/FSM/MultiInitialStateNFA.cpp

alib2data/src/automaton/FSM/NFA.cpp

alib2data/src/automaton/PDA/DPDA.cpp

alib2data/src/automaton/PDA/InputDrivenNPDA.cpp

alib2data/src/automaton/PDA/NPDA.cpp

...ata/src/automaton/PDA/RealTimeHeightDeterministicDPDA.cpp

alib2data/src/std/compare.hpp

alib2data/src/std/variant.hpp