Resolve memory leaks in pyx files - Issue #1

ltfatpy/comp/comp_dct.c

ltfatpy/comp/comp_dct.pyx

ltfatpy/comp/comp_dst.c

ltfatpy/comp/comp_dst.pyx

ltfatpy/comp/comp_gabdual_long.c

ltfatpy/comp/comp_gabdual_long.pyx

ltfatpy/comp/comp_gabtight_long.c

ltfatpy/comp/comp_gabtight_long.pyx

ltfatpy/comp/comp_isepdgt.c

ltfatpy/comp/comp_isepdgt.pyx

ltfatpy/comp/comp_isepdgtreal.c

ltfatpy/comp/comp_isepdgtreal.pyx

ltfatpy/comp/comp_pgauss.c

ltfatpy/comp/comp_pgauss.pyx

ltfatpy/comp/comp_sepdgt.c

ltfatpy/comp/comp_sepdgt.pyx

ltfatpy/comp/comp_sepdgtreal.c

ltfatpy/comp/comp_sepdgtreal.pyx