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 switch3;
extern(C) int printf(char*, ...);

void main()
{
    char[] str = "hello";
    int i;
    switch(str)
    {
    case "world":
        i = 1;
        assert(0);
    case "hello":
        i = 2;
        break;
    case "a","b","c":
        i = 3;
        assert(0);
    default:
        i = 4;
        assert(0);
    }
    assert(i == 2);
    printf("SUCCESS\n");
}