Bug#758843: haskell-platform: New upstream version

[Neil Mayhew]

Source: haskell-platform
Version: 2014.2.0.0.debian2
Severity: wishlist

The version requested by the original reporter has already been
packaged, but there's now a new version (7.10.2-a) as of today, and the
previous version (7.10.2) was released a few weeks ago.

https://haskell.org/platform/download/7.10.2/haskell-platform-7.10.2-a.tar.gz

Also, the Vcs-Darcs field is outdated. The VCS is now at github
(https://github.com/haskell/haskell-platform). Maybe add a watch file too?