ddox documentation generator

[Sönke Ludwig]

There were still some bugs and inconsistencies with how DMD handles DDOC
macros. I've uploaded a fixed version, also with syntax highlighting
enabled in text sections*. std.algorithm for example now also has its
overview table (with invalid links of course):

http://vibed.org/temp/phobos/std/algorithm.html

Generally, the phobos docs look much better now.

* you may need to press F5 to reload the style sheet