[s2p] added automatic git pull of the src in  build method
[s2p] fix bug in helper_convert_outputs.sh script
[s2p] fix 'git pull' call in build method of app.py
[s2p] added datasets
[s2p] handle case of panchro-only datasets
[s2p] added link to result page on the archive index, plus logos at the
bottom of the archive index page
[s2p] added link to result page and logos on the archive_details page
too
[s2p] Minor changes on results.html page
[s2p] nicer params page
[s2p] fixed helper_convert_inputs.py to click on the center of the ROI
instead of the top-left corner