there was an offset calculated from Int type by using Abs() method and a carry was not checked
(if there is a carry we should not make addition -- the argument is too small)
this had no impact on calculated values because there was a crash (bus error) immediately
following program could crash (64bit):
typedef ttmath::Big<1, 8> MyBig;
ttmath::Parser<MyBig> parser;
parser.Parse("2^(2^63) + 1");
fixed: similar problems were in methods Big::BitAnd() Big::BitOr() and Big::BitXor() (bitwise operations)
and they could return incorrect values
git-svn-id: svn://ttmath.org/publicrep/ttmath/trunk@1189 e52654a7-88a9-db11-a3e9-0013d4bc506e