LDpC decoder over GF(q) it contains only matrices for q=4 and 8 in alist from
File list:
LDPC-v0.2
........\20000.10000.3.631.alist
........\4986.93xb.329.alist
........\GF2_LDPC.c
........\GFq_LDPC_NTT.c
........\q4.sp.9000.6000.4500.1
........\q8.sp.6000.4000.3000.1