Smaller pie chart for officer ratio

Prevents highlights on hover from getting clipped.
Return paid/unpaid counts
Split officers registered into paid/unpaid
Merge branch 'officer-registration-status'
LEFT JOIN to include clubs with 0 officers
Index for name/value searches

Should make statistics generating orders of magnitude faster when we check for both keys and values.
Merge branch 'officer-registration-status'
Correcting query

Was counting also rows, where no matching registration was found.
Merge branch 'officer-registration-status'
Removing annotations for 0 values
Annotations don't need to be strings
Removing annotations

There's a bug in Google Charts that in some cases prevents the annotations
from being correctly displayed, breaking the whole purpose.
Correcting index name