PGI: add easyconfig for version 16.3.

New easyconfigs for GROMOS++ and gromosXX

New easyconfig for DFT-D3

{data,vis}[intel/2016a] ROOT v5.34.36, freetype v2.6.3

add easyconfig for ROOT v5.30.06 with goolf toolchain

add easyconfig ROOT-v5.34.36-intel-2016a-Python-2.7.11.eb, add easyconfig freetype-2.6.3-intel-2016a.eb

{data}[intel/2016a] dask v0.8.2 w/ Python 2.7.11 & 3.5.1

add XZ as dependency in Python 3.5.1 easyconfigs, required for lzma

{tools}[intel/2016a] worker v1.6.4

fix Perl dependency in worker, it required non-standard Perl modules

{lang}[intel/2015a] Perl v5.20.3

fix bitstring 3.1.3 download URL