Stewart's Utility Library 0.10 release - now exclusively for D2

[Stewart Gordon]

As some of you have heard already, I've taken the plunge and switched to D2.

And, having seemingly discovered that most people have already left D1 behind, and that 
it's now harder than it was to make code compatible with both languages, I have decided to 
make my libraries D2-only.

Other updates include the addition of DimensionedValue, my own stab at the old problem of 
primitive units checking, changing DateInterval and TimeInterval from kludgy typedefs to 
structs, and enforcing that set elements are immutable.

http://pr.stewartsplace.org.uk/d/sutil/

Stewart.