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.

module interface7;

extern(C) int printf(char*,...);

interface I
{
}

class C : I
{
}

void main()
{
    I i = new C;
    ClassInfo ci = i.classinfo;
    char[] name = ci.name;
    printf("ci.name = %.*s\n", name.length, name.ptr);
    ClassInfo cI = I.classinfo;
    name = cI.name;
    printf("cI.name = %.*s\n", name.length, name.ptr);
    assert(ci is cI);
}