subscriptions 5.x-1.9

Fix email subject when there are multiple subscribers.
Remove vocabulary prefix when displaying categories (fieldset has vocabulary name).

From 5.x-1.8:
Add setting to omit subscribe link with teasers.
From 5.x-1.7:
Fix for category subscriptions.
From 5.x-1.6:
Fixed "omitted content types" (need to resave setting after this update),
fixed node_access check (particularly helps sending via cron).

Reminder: check access control settings after update when upgrading from 5.x-1.4 or older.