Merge pull request #804 from hpcugent/develop

release EasyBuild v1.10.0
gen_builddir: do not create unique dir if cleanoldbuild is true
Updated test for gen_builddir
Fix error in using repository.py
Move the default config.cfg to $XDG_CONFIG_HOME

The new place for config.cfg is now
$XDG_CONFIG_HOME/easybuild/config.cfg
Add LIBRARY_PATH to generated Modulefiles.
use correct logger
fix docstring
initial format convert classes
add unittests for format convert classes
add support for ListOfStrings, DictOfStrings and
ListOfStringsAndDictOfStrings
add more tests for format_convert
initial support for suffix in versionoperators
version with suffix unittests fixed
insert skeleton class for dependency and patches
bump vsc-base to 1.7.5
implement Dependency class
add unittest for Dependency class
code refactoring
add tools.convert module with base convert classes