Thermal Expansion and Magnetization Studies of Novel Ferromagnetic Shape Memory Alloys Ni<SUB>52</SUB>Mn<SUB>12.5</SUB>Fe<SUB>12.5</SUB>Ga<SUB>23</SUB> and Ni<SUB>2</SUB>Mn<SUB>0.75</SUB>Cu<SUB>0.25</SUB>Ga