Add optional third party support for fullWebDAV.

This follows the directions fom http://wiki.nginx.org/HttpDavModule.
pstree: version bump from 2.33 to 2.36
nginx: Don't fetch the full WebDAV extension unless needed

Signed-off-by: Shea Levy <shea@shealevy.com>
xarchive: add gtk archiver
Merge pull request #504 from modulistic/master

pstree: version bump from 2.33 to 2.36
haskell-xmobar: update to version 0.17
haskell-binary-shared: update to version 0.8.3
haskell-case-insensitive: update to version 1.0.0.2
haskell-diagrams-lib: update to version 0.6.0.3
haskell-doctest: update to version 0.9.7
haskell-haxr: update to version 3000.9.1
haskell-hledger-lib: update to version 0.20.0.1
haskell-hledger-web: update to version 0.20.0.1
haskell-hledger: update to version 0.20.0.1
haskell-lifted-base: update to version 0.2.0.5
haskell-texmath: update to version 0.6.1.4
haskell-dual-tree: jailbreak to fix build with monoid-extras 0.3.x
haskell-diagrams-core: jailbreak to fix build with monoid-extras 0.3.x