- $tables: list of table names
- $rwdb: read-write database URI
+StartShowInviteForm: Right before displaying the invitations form
+- $action: invitation action
+
+EndShowInviteForm: After displaying the invitations form
+- $action: invitation action
+
+StartSendInvitations: Right before sending invitations
+- $action: invitation action
+
+EndSendInvitations: Right after sending invitations
+- $action: invitation action
+
+StartShowInvitationSuccess: Right before showing invitations success msg
+- $action: invitation action
+
+EndShowInvitationSuccess: After showing invitations success msg
+- $action: invitation action
+
+StartUpgrade: when starting a site upgrade
+
+EndUpgrade: when ending a site upgrade; good place to do your own upgrades
+
+HaveIMPlugin: is there an IM plugin loaded?
+- &$haveIMPlugin: set me to true if you're loaded!
+