Port Perl-5.20.3 to foss/2015b, for vcftools

fix determining list of easyconfigs, don't assume locations are correct

{bio} [goolf-1.4.10] StringTie-1.2.2 (REVIEW)

New EasyConfig for IPython 3.2.3 with Python 2.7.11 and foss-2015

New EasyConfig for GEOS 3.5.0 with the foss-2015a toolchain

Doxygen EasyConfigs with added dependency EasyConfigs

New EasyConfig for libxml2 2.9.3 with the foss-2015a toolchain

New EasyConfig for PyZMQ 15.2.0 with foss-2015a toolchain and Python 2.7.11

New EasyConfig for CMake 3.4.1 with GCC 4.9.2

use libxml2 easyblock

New EasyConfigs for FreeXL with various toolchains

Libreadline easyconfig for old ictce-5.4.0 toolchain

New EasyConfig for SWIG 3.0.8 with the foss-2015a toolchain

New EasyConfig for ZeroMQ 4.1.4 with the foss-2015a toolchain