std.bitmanip improvements

[Era Scarecrow]

On Thursday, 27 December 2012 at 10:16:51 UTC, Dmitry Olshansky 
wrote:
> IRC Era Scarecrow did an amazing job on it that covered a lot 
> of enhancements including small string optimization, appending, 
> slicing etc.
>
> I recall reviewing his code and it was a Phobos pull once but 
> then it pulled out (for further enhancement? dunno). So 
> definitely suggest you two to get in touch.

  I'm glad for the praise... :)

  Perhaps it seems silly, however I pulled it not because I needed 
to enhance it, but because it had trouble merging with other 
pulls. I looked at the error(s) and it was something like '13 
white spaces mismatches'... How do you fix 13 white spaces? 
They're white space because you can't see them :P Had it been 
lines of code you can intelligently re-order or adjust them, but 
white spaces?? Sheesh...

  Maybe being lazy but it was a headache trying to figure out the 
diff patch and how to fix it, so haven't tried too hard on it 
yet. If someone happens across that I'll give it another go and 
see if there's any other fixes/enhancements I can throw on it; 
Maybe get it in before the next release.