Conflicting default values of ignoreCase and caseSensitive

[Rod Widdowson]

> If neither ignoreCase nor caseSensitive is specified, which "default"
wins?

In 2.6, the caseSensitive default wins (false) in that in 2.6  ignoreCase is
_only_ consulted if it is present (and a warning issued).

I've removed ignoreCase default from the docs which may not be the correct
solution.  However my brain starts leaking out of my ears as soon as I try
to comprehend the multiple negatives involved in reasoning about this.

Rod