[FIX] google_calendar: browse user as SUPERUSER_ID to be able to write/update google_calendar info on user
[FIX] web_tip: scroll if needed prior to displaying a tip
[IMP] sale,purchase: allow invoicing

(closes #500)

(cherry picked from commit 84c0595aef3a417702c81b5226ae1f61817a2bf8)
[FIX] sale: move menu to avoid error at install of website_quote

(closes #2728)
(cherry picked from commit 2b1e1e70dd537f02f776e58c9def195ecff839c5)
[ADD] added website countdown snippet
[IMP] improved counter, added validation + reload-reset problem
[IMP] replaced snippet thumbnail image with FA
[IMP] anonymous user problem solved
[Add] Added button for switching between counter part and release part
[IMP] configured view-port for countdown timer
[imp] removed unnecessary code, removed date srtring parsing instade of that directly used date object from datepicker
[IMP] solved datepicker's z-index issue