add 'dimensional' and its missing dependency, 'numtype'

This pull request adds the following packages:

* dimensional (0.12.1)
* numtype (1.0.1) (dependency)

the built packages for i686 and x86_64 can be found at: https://sites.google.com/site/glgarchhaskell/packages

I am willing to maintain, i.e. reupload when new versions are available.