Fix border-radius in i-button radios/checkboxes
Improve room stats page style and features

* Template style boost and clean up
* Displays pending bookings in the table
* Allows occupancy stats since ever
Add flexible days_between util function
Fix room stats calculations
Integrate days_between functionality to iterdays
Replace old daysBetween for iterdays
Fix i-box-group
Fix i-box with buttons in the header
Base upcoming_occurrence_email in base email
Post-WIP fixes