Changed the handling of variadic intrinsics a bit. Removed the -fp80 option and made real be 80bit floats on X86, this is what the D spec really says it should be and fixes a bunch of issues. Changed the handling of parameter attributes to a bit more generalized approach. Added sext/zext attributes for byte/short/ubyte/ushort parameters, fixes #60 . Parameter attribs now properly set for intrinsic calls if necessary. Made the tango.math.Math patch less intrusive. Fixed/added some mini tests.

class C
{
    int c;
    long f(long l)
    {
        return l;
    }
}

class D : C
{
    int d;
    override long f(long l)
    {
        return l*2;
    }
}

void main()
{
    scope c = new C;
    assert(c.f(25L) == 25);
    scope d = new D;
    assert(d.f(25L) == 50);
    C cd = d;
    assert(cd.f(25L) == 50);
    assert(func(d,25L) == 50);
}

long func(C c, long l)
{
    return c.f(l);
}