Admins & owners allowed to book beyond date limits
Improved message box icon position and color
Fixed i-buttons not displaying disabled style
Message boxes: added footer style
Booking form page interface improvements

* Conflict warning checkboxes validation added
* Moved calendar specific styles to new file
* Other interface tweaks
Moved _show_confirm to RHRoomBookingNewBooking
Fixed non-admins booking in the past today

We are missing client-side validation for bookins in the past by hours.
Instead, serverside validation for bookings in the past is done by date.
Fixed show correct datepicker period onpageload
Post-rebase fixes
Prevent spamming emails for daily reservations

We mark all occurrences of a daily reservation as notified after the
first email is sent.