More scheduler work

- Added pds/instructor split (hides pads on hover now)
- Changed tr:hover to darker background for easier reading
Added search by month filter
Moved schedule view notes
Narrowed hosts rows
Replaced unit with email on instructor view
Removed map preview from host view
Removed allocated column from requests view
Narrowed instructor bio photo again (it looked dumb)
Put notes in table, added #notes id
Group by course.number
Fixed month order (after year rollover bug)
Housekeeping?