Append to paths, rather than prepend, so that the system doesn't
have to search through 50 paths to find standard tools.
Merge pull request #3 in APS/biotools-roll from bugfix/APS-24-biotools-module-overwhelms-path to master

* commit '037fcc6301d9ae2ef638fb3f793cb2e6efd581b3':
  Append to paths, rather than prepend, so that the system doesn't have to search through 50 paths to find standard tools.