I briefly looked and URLs in phpdoc2 are different from phpdoc. Basically we
have three options:
1) Make phpdoc2 generate same URLs;
2) Server-side translation of URLs (mod_rewrite or something);
3) Make Phd_PEAR generate phpdoc2-style URLs
I think 3) is the most feasible solution, but we should synchronize phpdoc and
Phd_PEAR upgrades to prevent an obvious issue when links in the DocBook-based
docs are different from those in API docs.