build_defs.mk: don't fail when TMP/TEMP is not present
remove assert that triggers unnecerrary message
git fetch fixed&documented; use reference repo in archive folder
deploy: on darwin/osx use tar to deploy
portz_invoke fixed to work in new rte
portz_install: works with -e; returns/shows overall result for all installed packages
portz: support invoke subcall
build_site: show/return overall result; check existence based on package name/not file name