Added index to ConversationDiscussions.cID for potential join to Collections table
Added index to ConversationDiscussions.cID for potential join to Collections table

MichaelMaar/concrete5,MichaelMaar/concrete5,matt9mg/concrete5,MichaelMaar/concrete5,matt9mg/concrete5,avdevs/concrete5,avdevs/concrete5,matt9mg/concrete5,TimDix/concrete5,avdevs/concrete5,TimDix/concrete5,TimDix/concrete5