DMD 2.000 alpha release

[Walter Bright]

This is an alpha release to try out the const/final/invariant stuff.

The current definition of string is:

	alias const(char)[] string;

Andrei has argued strongly to make it invariant. I think he's probably 
right, and that change might happen next.

The documentation isn't thorough, I don't want to spend too much time on 
it until I'm sure we've got the design right.

Treat this as an alpha release. Although it passes its test suite, I'm 
sure there are plenty of bugs remaining. Phobos also has not been 
thoroughly gone through to put const/final in all the right places.

See http://www.digitalmars.com/d/final-const-invariant.html

http://www.digitalmars.com/d/changelog.html

http://ftp.digitalmars.com/dmd.2.000.zip

Expect changes to this. Much more to come! For stability, I recommend 
sticking with the 1.0 series, which I will maintain with bug fixes.