changed Int::Div -- a remainder is not returning now but taking as a parameter (a pointer or reference)
changed order in parameters in UInt::AddTwoInts
added Int::AddInt
added Int::AddTwoInts
added Int::SubInt
changed Int::AddOne and Int::SubOne (much faster now)
fixed a bug in UInt::operator--() and Int::operator--() (there was adding instead of subtracting)
git-svn-id: svn://ttmath.org/publicrep/ttmath/trunk@13 e52654a7-88a9-db11-a3e9-0013d4bc506e
