Log Message:
Update from version 1.19nb1 to 1.20.

Pkgsrc changes:
 o Adjust dependencies to account for new requirements
 o Move some dependencies into BUILD_DEPENDS, since they're
   only required for "make test".

Upstream changes:

0.20 2009-02-05
        - No code changes since 0.19_01 dev release.
        - Add IDEAS.txt which is an irc log of discussion about the
          next-generation session plugin from discussion on #catalyst-dev
        - Remove TODO file, which is no longer relevant.

0.19_01 2009-01-09
        - Switch from using NEXT to Class::C3 for method re-dispatch.
        - Use shipit to package the dist.
        - Switch to Module::install.
        - Flash data is now stored inside the session (key "__flash") \ 
to avoid
          duplicate entry errors caused by simultaneous select/insert/delete of
          flash rows when using DBI as a Store. (Sergio Salvi)
        - Fix session finalization order that caused HTTP responses to be sent
          before the session is actually finalized and stored in its Store.
          (Sergio Salvi)