NTT: added InvNTT flag. Perform NTT+InvNTT and check that data are the same
NTT: added InvNTT flag. Perform NTT+InvNTT and check that data are the same

Bulat-Ziganshin/FastECC,Bulat-Ziganshin/FastECC,Bulat-Ziganshin/FastECC