Conversation search plus 3.6

Conversation search plus v1.6 changes:

All results now properly sorted by Date.

Conversation search plus v1.5 changes:

If searching by most recent conversations, the 'last message date' is now used as the search criteria.

Conversation search plus v1.4 changes:

1. Works with XF v2.0 and v2.1.
2. Conversation search plus link now located in sub-navigation.

Conversation search plus v1.3 changes:

Requires XF v2.1 or newer.

Conversation search plus v1.2 changes:

Added Recipients column to results page.

Conversation search plus v1.1 changes:

Updated PHP file to correct one permission variable.