Fixing log4j vulnerability

git subrepo pull sig_tools

subrepo:
  subdir:   "sig_tools"
  merged:   "a2077e16"
upstream:
  origin:   "git@github-rajivnarayan:cmap/mortar"
  branch:   "cmapM-v2.0.0"
  commit:   "a2077e16"
git-subrepo:
  version:  "0.4.3"
  origin:   "???"
  commit:   "???"

Fixes parse_gctx slicing issue #1

closing missing parens

initial release