Pre-booking for admins only when needed
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
Migrate event associations for bookings
Migrate booking list for event
Allow multiple locator targets in url_for()

Also allow RHs with parameterless __init__ methods (req is unused anyway)
Migrate booking details for event
Don't use UHs for the migrates RHs
Migrate booking modification for event
Remove debug crap
Migrate booking cloning for event
Don't allow room selection when cloning

This is pretty much a temporary solution until we preserve the form data
when changing the room via the dropdown selector.