DMD 0.170 release

[Chris Nicholson-Sauls]

Walter Bright wrote:
> Added foreach_reverse, which addresses a serious shortcoming.
> 
> http://www.digitalmars.com/d/changelog.html

I've been in the middle of a move, and therefore without internet for a while, so pardon 
me for responding late, but... Thank you, thank you, thank you, for adding 
delegate-as-aggregate!  I can now send all my multi-iterator boilerplate code to /dev/null 
and do the happy joy dance.  :)  And all the other fixes, etc.

-- Chris Nicholson-Sauls