clp-s: Implicit wildcard behaviour is unintuitive

[gibber9809]

Request

For clp-s the way that we treat wildcards is unintuitive.

The rules are that if a user adds any explicit wildcards we don't add any implicit ones, and we only add implicit wildcards at the start and end if the predicate contains a space.

To make things simpler for users we should make the user use explicit wildcards for everything.

Possible implementation

Instead of conditionally adding wildcards when processing a query we will simply not add implicit wildcards.