include EasyBuild version in build stats (fixes #257), fix order of keys in build statistics (using OrderedDict), pretty print them in repo easyconfig files (fixes #233)

put module naming scheme in place: only retain 0-9, a-z, A-Z, map everything else to '_' (refs #171)

get rid of getcfg/setcfg, replace updatecfg with cfg.update, replace get_name/get_version/get_toolkit with name/version/toolkit properties