idgames_sync.pl: document Log::Log4perl log output pattern
Makefile.PL: use ABSTRACT instead of ABSTRACT_FROM

­ Since the package name is not defined in 'idgames_sync.pl', then
  ABSTRACT_FROM won't work, as it looks for "package name -
  description" in whatever file is specified in ABSTRACT_FROM
Makefile.PL: remove IO::Uncompress::Gzip from dependencies
idgames_sync.pl: clarify wording of /newstuff total
idgames_sync.pl: use '=>' syntax when setting config values