[galaxy-commits] commit/galaxy-central: greg: Enhance the tool dependency package installation framework's InstallEnvironment object to have pointers to the root installation directory of both the repository and the tool dependency package. Enhance the prepare_step()_ functions in the various tool dependency package installation classes to receive the install_environment rather than just the package install_dir. This allows these functions to substitute reserved words like $REPOSITORY_INSTALL_DIR and $INSTA